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101-516: Pipeline was made available to the public on December 5, 2005, after years of planning and months of internal testing. It had replaced portions of CNN Interactive and the CNN.com website, placing that content in the subscription service. On June 27, 2007, CNN discontinued the CNN Pipeline service, to be succeeded by a free ad-supported live-video stream starting on July 2. If the stand-alone Windows program

202-515: A leap second is added at irregular intervals to civil time to keep clocks in sync with Earth's rotation. "Minute" comes from the Latin pars minuta prima , meaning "first small part" i.e. first division of the hour - dividing into sixty, and "second" comes from the pars minuta secunda , "second small part", dividing again into sixty. Analog clocks and watches often have sixty tick marks on their faces, representing seconds (and minutes), and

303-502: A wire service known as CNN Wire. CNN's digital storefront, which sells branded merchandise, household goods, and software, is operated by StackCommerce via partnership. In 2021, CNN Digital had an average of 144 million unique visitors in the United States according to Comscore , making it the most viewed digital news outlet, ahead of The New York Times , NBC News, Fox News, The Washington Post . The network also hosts CNN-10,

404-466: A "second hand" to mark the passage of time in seconds. Digital clocks and watches often have a two-digit seconds counter. SI prefixes are frequently combined with the word second to denote subdivisions of the second: milliseconds (thousandths), microseconds (millionths), nanoseconds (billionths), and sometimes smaller units of a second. Multiples of seconds are usually counted in hours and minutes. Though SI prefixes may also be used to form multiples of

505-773: A 24-hour cable news channel, and presently owned by the Manhattan -based media conglomerate Warner Bros. Discovery (WBD), CNN was the first television channel to provide 24-hour news coverage and the first all-news television channel in the United States . As of December 2023, CNN had 68,974,000 television households as subscribers in the US According to Nielsen , down from 80 million in March 2021. In June 2021, CNN ranked third in viewership among cable news networks, behind Fox News and MSNBC , averaging 580,000 viewers throughout

606-456: A daily 10-minute video show visible at the CNN website or YouTube. It replaced the long-running show CNN Student News which had been aired since 1989. It is aimed at a global audience of students, teachers, and adults, and was hosted by Carl Azuz. In fall of 2022, Carl Azuz was replaced by Coy Wire as the host of CNN 10, after leaving CNN due to a "personal decision" according to a CNN spokesperson in

707-628: A documentary miniseries produced by Tom Hanks , and Gary Goetzman which chronicled the United States in the 1960s. Owing to its success, CNN commissioned follow-ups focusing on other decades. Anderson Cooper 360° was expanded to run two hours long, from 8 pm to 10 pm. By 2019, CNN had produced at least 35 original series. Alongside the Hanks/Goetzman franchise (including the 2018 spin-off 1968 ), CNN has aired other documentary miniseries relating to news and U.S. policies, such as The Bush Years , and American Dynasties: The Kennedys —which saw

808-423: A factor of 100. Therefore a new definition of the second is planned. Atomic clocks now set the length of a second and the time standard for the world. 12960276813 408986496 × 10 − 9 {\displaystyle {\frac {12960276813}{408986496}}\times 10^{-9}} of the tropical year for 1900 January 0 at 12 h ET. 11th CGPM 1960 Resolution 9 CIPM 1967

909-533: A film division called CNN Films to distribute and produce made-for-TV and feature documentaries . Its first acquisition was a documentary entitled Girl Rising , a documentary narrated by Meryl Streep that focused on the struggles of girls' education. In July 2014, Cumulus Media announced that it would end its partnership with ABC News Radio , and enter into a new partnership with CNN to syndicate national and international news content for its stations through Westwood One beginning in 2015, including access to

1010-405: A focus on political news and discussion during the evening and primetime hours. The network's morning programming consists of Early Start , an early-morning news program now hosted by Kasie Hunt at 5–6 a.m. ET. This is followed by CNN This Morning , the network's morning show , hosted by Poppy Harlow and Phil Mattingly , at 6–9 a.m. ET. Since April 2023, CNN News Central has served as

1111-736: A food blog called "Eatocracy", which will "cover all news related to food – from recalls to health issues to culture". CNN had an internet relay chat (IRC) network at chat.cnn.com. CNN placed a live chat with Benjamin Netanyahu on the network in 1998. CNNHealth consists of expert doctors answering viewers' questions online at CNN's "The Chart" blog website. Contributors include Sanjay Gupta (Chief Medical Correspondent), Charles Raison (Mental Health Expert), Otis Brawley (Conditions Expert), Melina Jampolis (Diet and Fitness Expert), Jennifer Shu (Living Well Expert), and Elizabeth Cohen (Senior Medical Correspondent). In early 2008, CNN began maintaining

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1212-611: A formula describing a mean tropical year that decreased linearly over time. In 1956, the second was redefined in terms of a year relative to that epoch . The second was thus defined as "the fraction 1 ⁄ 31,556,925.9747 of the tropical year for 1900 January 0 at 12 hours ephemeris time". This definition was adopted as part of the International System of Units in 1960. Even the best mechanical, electric motorized and quartz crystal-based clocks develop discrepancies from environmental conditions; far better for timekeeping

1313-587: A live streaming broadcast available to cable and satellite subscribers who receive CNN at home (a precursor to the TV Everywhere services that would become popularized by cable and satellite providers beginning with Time Warner's incorporation of the medium). CNN International is broadcast live, as part of the RealNetworks SuperPass subscription service outside the U.S. CNN also offers several RSS feeds and podcasts . CNN also has multiple channels in

1414-522: A measure of radioactive decay, is measured in inverse seconds and higher powers of second are involved in derivatives of acceleration such as jerk . Though many derivative units for everyday things are reported in terms of larger units of time, not seconds, they are ultimately defined in terms of the SI second; this includes time expressed in hours and minutes, velocity of a car in kilometers per hour or miles per hour, kilowatt hours of electricity usage, and speed of

1515-565: A meter long; the fastest human sprinters run 10 meters in a second; an ocean wave in deep water travels about 23 meters in one second; sound travels about 343 meters in one second in air; light takes 1.3 seconds to reach Earth from the surface of the Moon, a distance of 384,400 kilometers. A second is directly part of other units, such as frequency measured in hertz ( inverse seconds or s ), speed in meters per second, and acceleration in meters per second squared. The metric system unit becquerel ,

1616-458: A microwave cavity. The fraction of excited atoms is then detected by laser beams. These clocks have 5 × 10 systematic uncertainty, which is equivalent to 50 picoseconds per day. A system of several fountains worldwide contribute to International Atomic Time. These caesium clocks also underpin optical frequency measurements. Optical clocks are based on forbidden optical transitions in ions or atoms. They have frequencies around 10  Hz , with

1717-523: A natural linewidth Δ f {\displaystyle \Delta f} of typically 1 Hz, so the Q-factor is about 10 , or even higher. They have better stabilities than microwave clocks, which means that they can facilitate evaluation of lower uncertainties. They also have better time resolution, which means the clock "ticks" faster. Optical clocks use either a single ion, or an optical lattice with 10 – 10 atoms. A definition based on

1818-407: A new version of the CNN.com website; the revamped site included the addition of a new "sign up" option, in which users can create their own username and profile, and a new "CNN Pulse" (beta) feature, along with a new red color theme. However, most of the news stories archived on the website were deleted. The topical news program Judy Woodruff's Inside Politics was the first CNN program to feature

1919-457: A newsletter published on September 18, 2022. On November 28, 2016, CNN announced the acquisition of Beme for a reported $ 25 million. On November 29, 2016, Matt Hackett, co-founder of Beme, announced via an email to its users that the Beme app would be shutting down on January 31, 2017. Since the shutdown of the app, it was announced that CNN intended to use the current talent behind Beme to work on

2020-422: A primary and a secondary use. From 8:00 - 20:00 EST on weekdays, the primary use was shown on the feeds, meanwhile all other times the secondary use was displayed. NOTE: The main news program was also on from 1:00 - 2:00 EST on pipe 2 on weekends. Also on weekends, "The Best Of CNN Pipeline" was on at 9:30 AM EST and at 8PM EST is "Pipeline on Stage". The live raw feeds was of news events as they took place around

2121-428: A round-up of blogs in 2005. Blog coverage was expanded when Inside Politics was folded into The Situation Room ( Inside Politics later returned to CNN in 2014, this time hosted by the network's chief national correspondent John King. ). In 2006, CNN launched CNN Exchange and CNN iReport , initiatives designed to further introduce and centralize the impact of everything from blogging to citizen journalism within

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2222-404: A rounded, flat look in a predominantly black, white, and red color scheme, and the introduction of a new box next to the CNN logo for displaying show logos and segment-specific graphics, rather than as a large banner above the lower third. The redesign also replaced the scrolling ticker with a static "flipper", which could either display a feed of news headlines (both manually inserted and taken from

2323-508: A second was selected to correspond exactly to the length of the ephemeris second previously defined. Atomic clocks use such a frequency to measure seconds by counting cycles per second at that frequency. Radiation of this kind is one of the most stable and reproducible phenomena of nature. The current generation of atomic clocks is accurate to within one second in a few hundred million years. Since 1967, atomic clocks based on atoms other than caesium-133 have been developed with increased precision by

2424-492: A separate start-up endeavor. Beme's current team will retain full creative control of the new project, which was slated to be released in the summer of 2017. Beme have also brought on other internet stars such as the host of Vsauce 3, Jake Roper, as head of production, who features prominently in Beme co-founder Casey Neistat 's vlogs. Beme News has since begun uploading news related video on YouTube . In October 2012, CNN formed

2525-465: A slate for 2023 that would include commissions such as Giuliani: What Happened to America's Mayor? , United States of Scandal , and The 2010s . In May 2024, CNN ordered a U.S. version of the long-running British news comedy panel show Have I Got News for You . CNN began broadcasting in the high-definition 1080i resolution format in September 2007. This format is now standard for CNN and

2626-552: A smaller box below the CNN bug, which displayed either the title, hashtag , or Twitter handle for the show being aired or its anchor. In April 2016, CNN began to introduce a new corporate typeface, known as "CNN Sans", across all of its platforms. Inspired by Helvetica Neue and commissioned after consultations with Troika Design Group, the font family consists of 30 different versions with varying weights and widths to facilitate use across print, television, and digital mediums. CNN International would also adopt these graphics, but with

2727-400: A turntable in rotations per minute. Moreover, most other SI base units are defined by their relationship to the second: the meter is defined by setting the speed of light (in vacuum) to be 299 792 458 m/s, exactly; definitions of the SI base units kilogram , ampere , kelvin , and candela also depend on the second. The only base unit whose definition does not depend on the second

2828-406: A wire service, and digital content for its station websites. The service was unbranded, allowing individual stations to integrate the content with their news brands. On July 9, 2020, citing "extraordinary circumstances in the current marketplace" and a need to prioritize the company's resources, Westwood One announced that the service would be discontinued on August 30. The audio simulcast of CNN

2929-436: A year (other than leap years ) is 31,536,000 seconds; and a ( Gregorian ) century averages 3,155,695,200 seconds; with all of the above excluding any possible leap seconds . In astronomy, a Julian year is precisely 31,557,600 seconds. Some common events in seconds are: a stone falls about 4.9 meters from rest in one second; a pendulum of length about one meter has a swing of one second, so pendulum clocks have pendulums about

3030-458: Is a cumulative difference over a part of the year. The effect is due chiefly to the obliqueness of Earth's axis with respect to its orbit around the Sun. The difference between apparent solar time and mean time was recognized by astronomers since antiquity, but prior to the invention of accurate mechanical clocks in the mid-17th century, sundials were the only reliable timepieces, and apparent solar time

3131-427: Is a unit of time , historically defined as 1 ⁄ 86400 of a day – this factor derived from the division of the day first into 24 hours , then to 60 minutes and finally to 60 seconds each (24 × 60 × 60 = 86400). The current and formal definition in the International System of Units (SI) is more precise: The second [...] is defined by taking the fixed numerical value of the caesium frequency, Δ ν Cs ,

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3232-659: Is an unsigned clock depicting Orpheus in the Fremersdorf collection, dated between 1560 and 1570. During the 3rd quarter of the 16th century, Taqi al-Din built a clock with marks every 1/5 minute. In 1579, Jost Bürgi built a clock for William of Hesse that marked seconds. In 1581, Tycho Brahe redesigned clocks that had displayed only minutes at his observatory so they also displayed seconds, even though those seconds were not accurate. In 1587, Tycho complained that his four clocks disagreed by plus or minus four seconds. In 1656, Dutch scientist Christiaan Huygens invented

3333-685: Is available on all major cable and satellite providers. CNN's political coverage in HD was first given mobility by the introduction of the CNN Election Express bus in October 2007. The Election Express vehicle, capable of five simultaneous HD feeds, was used for the channel's CNN-YouTube presidential debates and for presidential candidate interviews. In December 2008, CNN introduced a comprehensive redesign of its on-air appearance, which replaced an existing style that had been used since 2004. On-air graphics took

3434-418: Is distributed on Entercom 's Radio.com website and app. Over the years, CNN has launched spin-off networks in the United States and other countries. Channels that currently operate include: CNN has also launched television and online ventures that are no longer in operation, including: CNN operates bureaus in the following cities as of February 2023 : Second The second (symbol: s )

3535-419: Is now one of the most popular news websites in the world. The widespread growth of blogs, social media and user-generated content have influenced the site, and blogs, in particular, have focused CNN's previously scattershot online offerings, most noticeably in the development and launch of CNN Pipeline in late 2005. In April 2009, CNN.com ranked third place among online global news sites in unique users in

3636-605: Is planning to cover major news events with the online, and digital news team in New York City , Atlanta , London , Hong Kong , San Francisco , Dubai , Johannesburg , Tokyo , and Beijing . CNN Newsource is a subscription -based affiliation video service that provides CNN content to television station affiliates with CNN, including terrestrial stations and international stations. Newsource allows affiliates to download videos from CNN, as well as from other affiliates who upload their video to Newsource. CNN also maintains

3737-412: Is the mole , and only two of the 22 named derived units, radian and steradian , do not depend on the second either. A set of atomic clocks throughout the world keeps time by consensus: the clocks "vote" on the correct time, and all voting clocks are steered to agree with the consensus, which is called International Atomic Time (TAI). TAI "ticks" atomic seconds. Civil time is defined to agree with

3838-413: Is the natural and exact "vibration" in an energized atom. The frequency of vibration (i.e., radiation) is very specific depending on the type of atom and how it is excited. Since 1967, the second has been defined as exactly "the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom". This length of

3939-405: Is used to denote hours and minutes). It rarely makes sense to express longer periods of time like hours or days in seconds, because they are awkwardly large numbers. For the metric unit of second, there are decimal prefixes representing 10 to 10 seconds. Some common units of time in seconds are: a minute is 60 seconds; an hour is 3,600 seconds; a day is 86,400 seconds; a week is 604,800 seconds;

4040-542: The RSS feeds of CNN.com), or "topical" details related to a story. CNN's next major redesign was introduced on January 10, 2011, replacing the dark, flat appearance of the 2008 look with a glossier, blue-and-white color scheme, moving the secondary logo box to the opposite end of the screen, and framing its graphics for the 16:9 aspect ratio (which is downscaled to a letterboxed format for standard definition feeds). On February 18, 2013, following Jeff Zucker's arrival as head of

4141-527: The Rydberg constant would involve fixing the value to a certain value: R ∞ = m e e 4 8 ε 0 2 h 3 c = m e c α 2 2 h {\displaystyle R_{\infty }={\frac {m_{\text{e}}e^{4}}{8\varepsilon _{0}^{2}h^{3}c}}={\frac {m_{\text{e}}c\alpha ^{2}}{2h}}} . The Rydberg constant describes

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4242-526: The U.S. Navy crew of a damaged electronic surveillance plane after the Hainan Island incident . The technology consisted of a videophone produced by 7E Communications Ltd of London, UK. This DNG workflow is used today by the network to receive material worldwide using an Apple MacBook Pro , various prosumer and professional digital cameras, software from Streambox Inc., and BGAN terminals from Hughes Network Systems . On October 24, 2009, CNN launched

4343-454: The mean time , as opposed to the apparent time displayed by sundials . By that time, sexagesimal divisions of time were well established in Europe. The earliest clocks to display seconds appeared during the last half of the 16th century. The second became accurately measurable with the development of mechanical clocks. The earliest spring-driven timepiece with a second hand that marked seconds

4444-491: The sidereal year at that epoch by the IAU in 1952. This extrapolated timescale brings the observed positions of the celestial bodies into accord with Newtonian dynamical theories of their motion. In 1955, the tropical year , considered more fundamental than the sidereal year, was chosen by the IAU as the unit of time. The tropical year in the definition was not measured but calculated from

4545-400: The 14th century, had displays that divided the hour into halves, thirds, quarters and sometimes even 12 parts, but never by 60. In fact, the hour was not commonly divided in 60 minutes as it was not uniform in duration. It was not practical for timekeepers to consider minutes until the first mechanical clocks that displayed minutes appeared near the end of the 16th century. Mechanical clocks kept

4646-424: The 2010s held the accuracy record: it gains or loses less than a second in 15 billion years, which is longer than the estimated age of the universe. Such a clock can measure a change in its elevation of as little as 2 cm by the change in its rate due to gravitational time dilation . There have only ever been three definitions of the second: as a fraction of the day, as a fraction of an extrapolated year, and as

4747-406: The 43rd anniversary of its launch, using gradients and rounded corners , thinner fonts, and a modified layout that moved the show title to a secondary tab on the lower third next to the segment title, and replaced the ticker with a static "flipper" for the first time since 2013, among other changes. Amid poor internal reception to the redesign and the firing of Chris Licht as head of CNN, elements of

4848-559: The Advancement of Science (BAAS) in 1862 stated that "All men of science are agreed to use the second of mean solar time as the unit of time." BAAS formally proposed the CGS system in 1874, although this system was gradually replaced over the next 70 years by MKS units. Both the CGS and MKS systems used the same second as their base unit of time. MKS was adopted internationally during the 1940s, defining

4949-557: The CNN Presidential Debate than any other CNN program in history. On July 27, 2012, CNN president Jim Walton announced he was resigning after 30 years at the network. Walton remained with CNN until the end of that year. In January 2013, former NBCUniversal President Jeff Zucker replaced Walton. On January 29, 2013, longtime political analysts James Carville and Mary Matalin , and fellow political contributor Erick Erickson were let go by CNN. In February 2022, Zucker

5050-497: The CNN brand. CNN iReport which features user-submitted photos and video, has achieved considerable traction, with increasingly professional-looking reports filed by amateur journalists, many still in high school or college. The iReport gained more prominence when observers of the Virginia Tech shootings sent in first-hand photos of what was going on during the shootings. In April 2010, CNN announced via Twitter that it would launch

5151-422: The CNN logo bug having a white on red color scheme to differentiate it from the domestic network. In August 2016, CNN announced the launch of CNN Aerial Imagery and Reporting (CNN AIR), a drone-based news collecting operation to integrate aerial imagery and reporting across all CNN branches and platforms, along with Turner Broadcasting and Time Warner entities. On June 1, 2023, CNN refreshed its graphics to mark

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5252-412: The Hanks/Goetzman decades miniseries), and Once in a Great City: Detroit 1962–64 . With the takeover of CNN by Chris Licht and Warner Bros. Discovery, it was announced in October 2022 that CNN would cut back on acquisitions and commissions from third-parties as a cost-cutting measure, but Licht stressed that "longform content remains an important pillar of our programming", while the network announced

5353-502: The Sun (a year) was much more stable than Earth's rotation. This led to proposals as early as 1950 to define the second as a fraction of a year. The Earth's motion was described in Newcomb's Tables of the Sun (1895), which provided a formula for estimating the motion of the Sun relative to the epoch 1900 based on astronomical observations made between 1750 and 1892. This resulted in adoption of an ephemeris time scale expressed in units of

5454-413: The Sun in the sky called apparent time , does not keep uniform time. The time kept by a sundial varies by time of year, meaning that seconds, minutes and every other division of time is a different duration at different times of the year. The time of day measured with mean time versus apparent time may differ by as much as 15 minutes, but a single day differs from the next by only a small amount; 15 minutes

5555-403: The U.S., according to Nielsen/NetRatings; with an increase of 11% over the previous year. CNN Pipeline was the name of a paid subscription service, its corresponding website, and a content delivery client that provided streams of live video from up to four sources (or "pipes"), on-demand access to CNN stories and reports, and optional pop-up "news alerts" to computer users. The installable client

5656-778: The US domestic version has absorbed international news coverage in order to reduce programming costs. The American version, sometimes referred to as CNN (US), is also available in Canada, and some islands in the Caribbean. CNN also licenses its brand and content to other channels, such as CNN-News18 in India. In Japan it broadcasts CNNj which started in 2003, with simultaneous translation in Japanese. The Cable News Network launched at 5:00 p.m. Eastern Time on June 1, 1980. After an introduction by Ted Turner ,

5757-635: The Union co-hosted by Jake Tapper and Dana Bash at 9 a.m. ET followed by the international affairs program Fareed Zakaria GPS at 10 a.m. ET and Inside Politics with Manu Raju at 11 a.m. ET. Weekend primetime, starting at 9 p.m. ET on Saturday and 8 p.m. ET on Sunday, is dedicated mostly to factual programming , such as documentary specials and miniseries like The Whole Story with Anderson Cooper . Documentary-style reality series, such as Anthony Bourdain: Parts Unknown and United Shades of America , and acquired documentary films presented under

5858-582: The Wednesday edition of Newsnight has been replaced with King Charles , a limited-run late-night talk show helmed by Gayle King and Charles Barkley . The network's weekend morning programming begins with CNN Newsroom (simulcast from CNN International ) at 4–6 a.m. ET every Saturday and 3–6 a.m. ET every Sunday. CNN Newsroom also airs throughout the day between noon and 8 p.m. ET with hosts Fredricka Whitfield and Jim Acosta . Each weekend day from 6 a.m. ET, until 8 a.m. ET Saturday and 9 a.m. ET Sunday are

5959-552: The atoms move very fast, causing Doppler shifts. The radiation needed to cool the hydrogen – 121.5 nm – is also difficult. Another hurdle involves improving the uncertainty in QED calculations, specifically the Lamb shift in the 1s-2s transition of the hydrogen atom. A redefinition must include improved optical clock reliability. TAI must be contributed to by optical clocks before the BIPM affirms

6060-605: The attacks for 15 and a half hours. Free access for Pipeline was offered for a day on November 6, 2006, in line with the US mid-term elections' coverage. CNN Pipeline's anchors were Veronica De La Cruz , Nicole Lapin , Melissa Long and Richard Lui . The four shared the anchor seat in front of a virtual studio in the CNN Center . Like other CNN stations, the anchors of CNN Pipeline conducted interviews with CNN reporters, and use CNN studios for videoconference interviews. The program

6161-473: The banner CNN Films may also air during weekend primetime. For the 2014–15 season, after canceling Piers Morgan Tonight (which, itself, replaced the long-running Larry King Live ), CNN experimented with running factual and reality-style programming during the 9:00 p.m. ET hour, such as John Walsh 's The Hunt , This Is Life with Lisa Ling , and Mike Rowe 's Somebody's Gotta Do It . Then-president Jeff Zucker explained that this new lineup

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6262-402: The caesium atom used to realize the definition. In a laboratory sufficiently small to allow the effects of the non-uniformity of the gravitational field to be neglected when compared to the uncertainties of the realization of the second, the proper second is obtained after application of the special relativistic correction for the velocity of the atom in the laboratory. It is wrong to correct for

6363-455: The channel was being simulcast on CNN International). This prevented popular CNN personalities from anchoring live breaking news except when CNN International simulcasted the American service. Subscribers also received access to much of CNN's archive through the pipeline player. Additionally, regular featured programs found on CNN's American services were unavailable to Pipeline users. This fact

6464-577: The day, down 49% from a year earlier, amid sharp declines in viewers across all cable news networks. While CNN ranked 14th among all basic cable networks in 2019, then jumped to 7th during a major surge for the three largest cable news networks (completing a rankings streak of Fox News at number 5 and MSNBC at number 6 for that year), it settled back to number 11 in 2021 and had further declined to number 21 in 2022. Globally, CNN programming has aired through CNN International , seen by viewers in over 212 countries and territories. Since May 2019, however,

6565-631: The desktop program), rather funneling all of the content into CNN.com 's video section for free. This transfer of Pipeline from a pay service to an integrated free service came at a time of video being offered online for free en masse , such as YouTube and TV networks offering full TV shows free online with ads , which did not exist at Pipeline's inception. In September 2014, CNN announced CNNgo , an online service, effectively replacing Pipeline. The service contains many features from Pipeline, such as live shows and news clips. CNN Pipeline maintained four simultaneous feeds (known as "pipes"), which had both

6666-457: The energy levels in a hydrogen atom with the nonrelativistic approximation E n ≈ − R ∞ c h n 2 {\displaystyle E_{n}\approx -{\frac {R_{\infty }ch}{n^{2}}}} . The only viable way to fix the Rydberg constant involves trapping and cooling hydrogen. This is difficult because it is very light and

6767-709: The executive team under Chris Licht - the Quad composed of David Leavy, chief operating officer, and three executive vice presidents (Virginia Moseley for editorial, Amy Entelis for talent, and Eric Sherling for programming) - in place, but expanded their responsibilities. Moseley became the network's first executive editor and would have both national and international news. Adding their ranks, Thompson made Alex MacCallum, who worked with Thompson at The New York Times, executive vice president of digital products. In highlighting these moves, Thompson emphasized existing staff would need to get used to change. In July 2024, CNN announced that it

6868-499: The first pendulum clock. It had a pendulum length of just under a meter, giving it a swing of one second, and an escapement that ticked every second. It was the first clock that could accurately keep time in seconds. By the 1730s, 80 years later, John Harrison 's maritime chronometers could keep time accurate to within one second in 100 days. In 1832, Gauss proposed using the second as the base unit of time in his millimeter–milligram–second system of units . The British Association for

6969-458: The footnote was added at the 86th (1997) meeting of the CIPM GCPM 1998 7th Edition SI Brochure A future re-definition of the second would be justified if these idealized conditions can be achieved much easier than with the current definition. The definition of the second should be understood as the definition of the unit of proper time: it applies in a small spatial domain that shares the motion of

7070-496: The highest ratings of any CNN original series premiere to-date, with 1.7 million viewers. Parts Unknown concluded after the 2018 suicide of its host Anthony Bourdain ; CNN announced several new miniseries and docuseries for 2019, including American Style (a miniseries produced by the digital media company Vox Media ), The Redemption Project with Van Jones , Chasing Life with Sanjay Gupta , Tricky Dick (a miniseries chronicling Richard Nixon ), The Movies (a spin-off of

7171-596: The hour like the modern second (=   ⁠ hour / 60×60 ⁠ ). Sundials and water clocks were among the earliest timekeeping devices, and units of time were measured in degrees of arc. Conceptual units of time smaller than realisable on sundials were also used. There are references to "second" as part of a lunar month in the writings of natural philosophers of the Middle Ages, which were mathematical subdivisions that could not be measured mechanically. The earliest mechanical clocks, which appeared starting in

7272-645: The husband and wife team of David Walker and Lois Hart anchored the channel's first newscast. Burt Reinhardt , the executive vice president of CNN, hired most of the channel's first 200 employees, including the network's first news anchor , former ABC News Capitol Hill senior correspondent Bernard Shaw . Since its debut, CNN has expanded its reach to several cable and satellite television providers, websites, and specialized closed-circuit channels (such as CNN Airport ). The company has 42 bureaus (12 domestic, 31 international), more than 900 affiliated local stations (which also receive news and features content via

7373-456: The impending attack. The company was honored at the 2008 Technology & Engineering Emmy Awards for development and implementation of an integrated and portable IP-based live, edit and store-and-forward digital news gathering (DNG) system. The first use of what would later win CNN this award was in April 2001 when CNN correspondent Lisa Rose Weaver covered, and was detained, for the release of

7474-408: The local gravitational field. The reference to an unperturbed atom is intended to make it clear that the definition of the SI second is based on an isolated caesium atom that is unperturbed by any external field, such as ambient black-body radiation. The second, so defined, is the unit of proper time in the sense of the general theory of relativity. To allow the provision of a coordinated time scale,

7575-431: The microwave frequency of a caesium atomic clock, which have each realized a sexagesimal division of the day from ancient astronomical calendars. Civilizations in the classic period and earlier created divisions of the calendar as well as arcs using a sexagesimal system of counting, so at that time the second was a sexagesimal subdivision of the day (ancient second   =   ⁠ day / 60×60 ⁠ ), not of

7676-913: The network's rolling news block on weekdays, with its morning edition from 9 a.m. to noon ET anchored by John Berman , Kate Bolduan , and Sara Sidner , and its afternoon edition from 1–4 p.m. ET anchored by Brianna Keilar and Boris Sanchez. In the noon hour is Inside Politics , hosted by Dana Bash . CNN's late afternoon and early evening lineup consists of The Lead with Jake Tapper at 4–5 p.m. ET and The Situation Room with Wolf Blitzer at 5–7 p.m. ET. The network's evening and prime time lineup shifts towards more in-depth programming, including Erin Burnett OutFront at 7 p.m. ET, Anderson Cooper 360° at 8 p.m. ET, and The Source with Kaitlan Collins at 9 p.m. ET. The 10 p.m. and 11 p.m. hours are filled by CNN Newsnight with Abby Phillip and Laura Coates Live respectively. From November 2023,

7777-450: The network, the "flipper" was dropped and reverted to a scrolling ticker. On August 11, 2014, CNN introduced a new graphics package, dropping the glossy appearance for a flat, rectangular scheme incorporating red, white, and black colors, and the Gotham typeface. The ticker alternated between general headlines and financial news from CNN Business , and the secondary logo box was replaced with

7878-476: The popular video-sharing site YouTube , but those videos can only be viewed in the United States, a source of criticism among YouTube users worldwide. In 2014, CNN launched a radio version of their television programming on TuneIn Radio. On March 7, 2017, CNN announced the official launch of its virtual reality unit named CNNVR. It will produce 360 videos to its Android and iOS apps within CNN Digital. It

7979-502: The prior graphics began to be reinstated later that month, including the bolder typography previously used for lower third headlines. Further changes were made on August 14, 2023, with the return of the scrolling ticker and the show title box to make it closer resemble the 2014–23 graphics, but maintaining most of the other visual changes. On June 27, 2024, CNN hosted the first presidential debate for former President Donald Trump and President Joe Biden. CNN claimed that more people watched

8080-553: The realization of the second based on the Cs hyperfine transition frequency, but some can be reproduced with superior stability. SI Brochure 9 In 2022, the best realisation of the second is done with caesium primary standard clocks such as IT-CsF2, NIST-F2, NPL-CsF2, PTB-CSF2, SU–CsFO2 or SYRTE-FO2. These clocks work by laser-cooling a cloud of Cs atoms to a microkelvin in a magneto-optic trap. These cold atoms are then launched vertically by laser light. The atoms then undergo Ramsey excitation in

8181-469: The rotation of the Earth with respect to the Sun, and does not contain any leap seconds. UT1 always differs from UTC by less than a second. While they are not yet part of any timekeeping standard, optical lattice clocks with frequencies in the visible light spectrum now exist and are the most accurate timekeepers of all. A strontium clock with frequency 430  THz , in the red range of visible light, during

8282-409: The rotation of the Earth. The international standard for timekeeping is Coordinated Universal Time (UTC). This time scale "ticks" the same atomic seconds as TAI, but inserts or omits leap seconds as necessary to correct for variations in the rate of rotation of the Earth. A time scale in which the seconds are not exactly equal to atomic seconds is UT1, a form of universal time . UT1 is defined by

8383-412: The second as 1 ⁄ 86,400 of a mean solar day. Sometime in the late 1940s, quartz crystal oscillator clocks with an operating frequency of ~100 kHz advanced to keep time with accuracy better than 1 part in 10 over an operating period of a day. It became apparent that a consensus of such clocks kept better time than the rotation of the Earth. Metrologists also knew that Earth's orbit around

8484-461: The second such as kiloseconds (thousands of seconds), such units are rarely used in practice. An everyday experience with small fractions of a second is a 1-gigahertz microprocessor that has a cycle time of 1 nanosecond. Camera shutter speeds are often expressed in fractions of a second, such as 1 ⁄ 30 second or 1 ⁄ 1000 second. Sexagesimal divisions of the day from a calendar based on astronomical observation have existed since

8585-424: The signals of different primary clocks in different locations are combined, which have to be corrected for relativistic caesium frequency shifts (see section 2.3.6). The CIPM has adopted various secondary representations of the second, based on a selected number of spectral lines of atoms, ions or molecules. The unperturbed frequencies of these lines can be determined with a relative uncertainty not lower than that of

8686-418: The standard today. A mechanical clock, which does not depend on measuring the relative rotational position of the Earth, keeps uniform time called mean time , within whatever accuracy is intrinsic to it. That means that every second, minute and every other division of time counted by the clock has the same duration as any other identical division of time. But a sundial , which measures the relative position of

8787-403: The third millennium BC, though they were not seconds as we know them today. Small divisions of time could not be measured back then, so such divisions were mathematically derived. The first timekeepers that could count seconds accurately were pendulum clocks invented in the 17th century. Starting in the 1950s, atomic clocks became better timekeepers than Earth's rotation, and they continue to set

8888-407: The unperturbed ground-state hyperfine transition frequency of the caesium 133 atom, to be 9 192 631 770 when expressed in the unit Hz , which is equal to s . This current definition was adopted in 1967 when it became feasible to define the second based on fundamental properties of nature with caesium clocks . Because the speed of Earth's rotation varies and is slowing ever so slightly ,

8989-610: The video newswire service CNN Newsource), and several regional and foreign-language networks around the world. The channel's success made a bona-fide mogul of founder Ted Turner and set the stage for conglomerate Time Warner 's (later WarnerMedia which merged with Discovery Inc. forming Warner Bros. Discovery ) eventual acquisition of the Turner Broadcasting System in 1996. CNN's current weekday schedule consists mostly of rolling news programming during daytime hours, followed by in-depth news and information programs with

9090-433: The weekend editions of CNN This Morning , hosted by Amara Walker and Victor Blackwell . On Saturdays, First of All with Victor Blackwell airs at 8 a.m. ET, followed by Smerconish with Michael Smerconish at 9 a.m. ET, The Chris Wallace Show at 10 a.m. ET and The Amanpour Hour with Christine Amanpour at 11 a.m. ET. The Sunday morning lineup consists primarily of political talk shows , starting with State of

9191-402: The world, and were chosen by Pipeline's producers. Graphics of headlines, stock market indexes, and sports headlines took the place of advertisements during the main news program, and also when an advertisement appeared on CNN International when being simulcasted on the service. Contractual obligations prohibited the direct simulcasting of CNN's American news channels, "CNN" and " HLN " (unless

9292-512: Was announced that Chris Licht —known for his work at MSNBC and CBS—would be the next president of CNN; he was planned to be instated after the spin off and merger of WarnerMedia into Discovery Inc. Licht started his tenure in May 2022, and his tenure ended in June 2023. In August 2023, it announced Mark Thompson , formerly of The New York Times , as its next CEO. In one of his first major moves, he kept

9393-490: Was asked to resign by Jason Kilar , the chief executive of CNN's owner WarnerMedia, after Zucker's relationship with one of his lieutenants was discovered during the investigation into former CNN primetime host Chris Cuomo 's efforts to control potentially damaging reporting regarding his brother Andrew Cuomo , governor of New York. Kilar announced that the interim co-heads would be executive vice presidents Michael Bass, Amy Entelis , and Ken Jautz . On February 26, 2022, it

9494-479: Was available to users of PCs running Microsoft Windows . There was also a browser-based "web client" that did not require installation. The service was discontinued in July 2007, and was replaced with a free streaming service. On April 18, 2008, CNN.com was targeted by Chinese hackers in retaliation for the channel's coverage on the 2008 Tibetan unrest . CNN reported that they took preventive measures after news broke of

9595-432: Was based in the United States and its programming is heavily aimed towards American viewers, users in 40 other countries were able to subscribe to the service and view Pipeline content. CNN Interactive Cable News Network ( CNN ) is a multinational news channel and website operating from Midtown Atlanta , Georgia, U.S. Founded in 1980 by American media proprietor Ted Turner and Reese Schonfeld as

9696-460: Was broadcast on weekdays from 8:00 AM - 8:00 PM and weekends from 1:00 - 2:00 AM (both times Eastern Time). The news program periodically simulcasted either CNN International North America's feed, or CNN U.S. during breaking news events. Because of the compression required, CNN Pipeline could not be considered a live broadcast - however, the delay was usually in seconds . CNN Pipeline offered three levels of subscriptions: While CNN Pipeline

9797-475: Was cutting one hundred jobs, or about 3% of its total workforce. The company also announced that it was consolidating three newsrooms into one, namely, its U.S. news gathering, international news gathering and digital news gathering operations. CNN's global workforce, in July 2024, included roughly 3,500 people. CNN launched its website, CNN.com (initially known as CNN Interactive ), on August 30, 1995. The site attracted growing interest over its first decade and

9898-406: Was intended to shift CNN away from a reliance on pundit -oriented programs, and attract younger demographics to the network. Zucker stated that the 9:00 p.m. hour could be pre-empted during major news events for expanded coverage. These changes coincided with the introduction of a new imaging campaign for the network, featuring the slogan "Go there". In May 2014, CNN premiered The Sixties ,

9999-454: Was not made clear in advertisements for the service, so some American or Canadian users expecting online access to CNN and Headline News , to which they were accustomed, were disappointed. Pipes was also used for special events as well. On September 11, 2006, the fifth anniversary of the September 11, 2001 attacks , CNN Pipeline carried a real-time rebroadcast of CNN's then-live coverage of

10100-486: Was opened after June 27, CNN initiated an automatic uninstallation of the software from the subscriber's hard drive. CNN said that while it would continue to provide the four live video streams and video archives, it was abandoning the subscription model. According to CNN's blog , the reason they discontinued the service was to encourage a greater number of people to use the service. They stated they were not actually getting rid of Pipeline, or any of its features (other than

10201-401: Was the only generally accepted standard. Fractions of a second are usually denoted in decimal notation, for example 2.01 seconds, or two and one hundredth seconds. Multiples of seconds are usually expressed as minutes and seconds, or hours, minutes and seconds of clock time, separated by colons, such as 11:23:24, or 45:23 (the latter notation can give rise to ambiguity, because the same notation

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