47-767: Lourenço is a town and district in the Brazilian municipality of Calçoene , in the interior of the state of Amapá . The main economic activities of the town is gold mining . It is one of the oldest mines in Brazil . Gold mining in Lourenço began in the 19th century. In 1894, at the height of the gold rush, there were 6,000 to 10,000 gold miners in the area around the Calçoene River . In 1984, Mineração Novo Astro (MNA) and Mineração Yukio Yoshidome (MYYSA) were awarded concessions for mining on an industrial scale. This resulted in conflicts with
94-471: A component of the relative velocity of the Sun as it is observed in the sky. Relative velocity is the motion of an object from the point of view of an observer in a frame of reference . From a fixed position on the ground, the Sun appears to orbit around Earth. To an observer in an inertial frame of reference , planet Earth is seen to rotate about an axis and orbit around the Sun in an elliptical path with
141-410: A leap day re-aligns the calendar with the orbit. Thus the solstices always occur between June 20 and 22 and between December 20 and 23 in a four-year-long cycle with the 21st and 22nd being the most common dates, as can be seen in the schedule at the start of the article. Using the current official IAU constellation boundaries—and taking into account the variable precession speed and the rotation of
188-719: A midwinter party, to celebrate that the Sun is at its lowest point and coming back. The Fremont Solstice Parade takes place every summer solstice in Fremont, Seattle, Washington in the United States . The reconstructed Cahokia Woodhenge , a large timber circle located at the Mississippian culture Cahokia archaeological site near Collinsville, Illinois , is the site of annual equinox and solstice sunrise observances. Out of respect for Native American beliefs these events do not feature ceremonies or rituals of any kind. Unlike
235-607: A noise festival, to call the Sun back. Further east, the Aymara people celebrate their New Year on 21 June. A celebration occurs at sunrise, when the sun shines directly through the Gate of the Sun in Tiwanaku . Other Aymara New Year feasts occur throughout Bolivia , including at the site of El Fuerte de Samaipata . In the Hindu calendar , two sidereal solstices are named Makara Sankranti which marks
282-537: A wider sense, as the date (day) that such a passage happens. The solstices, together with the equinoxes, are connected with the seasons. In some languages they are considered to start or separate the seasons; in others they are considered to be centre points (in England , in the Northern Hemisphere, for example, the period around the northern solstice is known as midsummer). Midsummer's Day , defined as St. Johns Day by
329-469: A year into 24 solar terms (節氣). Xiàzhì ( pīnyīn ) or Geshi ( rōmaji ) ( Chinese and Japanese : 夏至; Korean : 하지(Haji) ; Vietnamese : Hạ chí ; lit. summer's extreme ) is the 10th solar term, and marks the summer solstice . It begins when the Sun reaches the celestial longitude of 90° (around 21 June) and ends when the Sun reaches the longitude of 105° (around 7 July). Xiàzhì more often refers in particular to
376-572: Is a municipality located in the east of the state of Amapá in Brazil . It is located on the Atlantic Ocean in the Amazon jungle basin near French Guiana . Calçoene covers 14,269 square kilometres (5,509 sq mi) and has a population is 11,306. The name Calçoene is a corruption of "Calço N" (North Wedge, one of four mining zones defined by the Brazilian Government at the beginning of
423-438: Is bordered on the north and east by the Atlantic Ocean , to the south by the municipalities of Amapá and Pracuúba , and to the west by the municipalities of Oiapoque and Serra do Navio . Calçoene is 272 kilometres (169 mi) from the state capital of Macapá . The municipality contains 23.23% of the 2,369,400 hectares (5,855,000 acres) Amapá State Forest , a sustainable use conservation unit established in 2006. One of
470-429: Is hardly detectable with indirect viewing based devices like sextant equipped with a vernier , and impossible with more traditional tools like a gnomon or an astrolabe . It is also hard to detect the changes in sunrise/sunset azimuth due to the atmospheric refraction changes. Those accuracy issues render it impossible to determine the solstice day based on observations made within the 3 (or even 5) days surrounding
517-545: Is in the zodiacal circle as well and periodically crosses the path of the Sun. As some of these crossings represent eclipses of the Moon, the path of the Sun is given a synonym, the ekleiptikos (kuklos) from ekleipsis , "eclipse". The two solstices can be distinguished by different pairs of names, depending on which feature one wants to stress. ( Gregorian calendar ) ( subsolar point ) ( Northern Hemisphere ) ( Southern Hemisphere ) The traditional East Asian calendars divide
SECTION 10
#1733085122902564-402: Is known as an equinox . There are two solstices and two equinoxes in a tropical year. Because of the variation in the rate at which the sun's right ascension changes, the days of longest and shortest daylight do not coincide with the solstices for locations very close to the equator. At the equator, the longest day is around 23 December and the shortest around 16 September (see graph). Inside
611-480: Is located in an area surrounded by protected areas and indigenous territories . The region around Lourenço has been polluted with mercury , and has been deforested . The school and clinic are functioning below standard. In 2017, Lourenço received 24 hour electricity. The town is connected to the BR-156 highway via an unpaved road. Cal%C3%A7oene Calçoene ( Portuguese pronunciation: [kawsoˈẽni] )
658-459: Is on a hill and has 127 large stones blocks of granite, each 3 metres (9.8 ft) high, and dug firmly into the ground. Archaeologist Mariana Petry Cabral of the Amapa Institute of Scientific and Technological Research (IEPA) said that the observatory has been designed to align with the winter solstice . Other agricultural societies also developed sophisticated ways to track important times in
705-574: Is the midnight sun or midsummer -night sun or polar day. On the other hand, places on the Antarctic Circle (latitude 66.56° south) will see the Sun just on the horizon during midday, and all places south of it will not see the Sun above horizon at any time of the day. That is the polar night . During the December Solstice, the effects on both hemispheres are just the opposite. This sees polar sea ice re-grow annually due to lack of sunlight on
752-468: The garimpeiros (illegal gold prospectors). In 1992, the Mining Cooperative of Garimpeiros of Lourenço (COOGAL) was founded, and the concessions were transferred to COOGAL in 1994. As of 2014, COOGAL operates five mining concessions and employs 1,100 garimpeiros . The official census figures for the district are an underestimation, and the actual population is estimated at 4,500 people. Lourenço
799-525: The Christian Church , is 24 June, about three days after the solstice itself). Similarly 25 December is the start of the Christmas celebration, and is the day the Sun begins to return to the Northern Hemisphere. The traditional British and Irish main rent and meeting days of the year, "the usual quarter days ," were often those of the solstices and equinoxes. Many cultures celebrate various combinations of
846-470: The seasons of the year are defined by reference to the solstices and the equinoxes . The term solstice can also be used in a broader sense, as the day when this occurs. For locations not too close to the equator or the poles, the dates with the longest and shortest periods of daylight are the summer and winter solstices, respectively. Terms with no ambiguity as to which hemisphere is the context are " June solstice " and " December solstice ", referring to
893-416: The solstitial colure , i.e. the times when the apparent geocentric celestial longitude of the Sun is equal to 90° (June solstice) or 270° (December solstice). The dates of the solstice varies each year and may occur a day earlier or later depending on the time zone . Because the earth's orbit takes slightly longer than a calendar year of 365 days, the solstices occur slightly later each calendar year, until
940-506: The 20th century). The city has the highest rainfall of any in Brazil, with an annual average of 4,165 millimetres (164.0 in). Calçoene is noted for its ancient megalithic observatory , often referred to as the "Amazon Stonehenge". The borders between French Guiana and Brazil were not clear, and in the 19th century, it was decided that the area between the Amazon and the Oyapock River
987-516: The Arctic or Antarctic Circles the sun is up all the time for days or even months. The seasons occur because the Earth's axis of rotation is not perpendicular to its orbital plane (the plane of the ecliptic ) but currently makes an angle of about 23.44° (called the obliquity of the ecliptic ), and because the axis keeps its orientation with respect to an inertial frame of reference . As a consequence, for half
SECTION 20
#17330851229021034-471: The Sun and planets across the paths of and in among the stars.* Cleomedes states: The band of the Zodiac ( zōdiakos kuklos , "zodiacal circle") is at an oblique angle ( loksos ) because it is positioned between the tropical circles and equinoctial circle touching each of the tropical circles at one point ... This Zodiac has a determinable width (set at 8° today) ... that is why it is described by three circles:
1081-418: The Sun at one focus . Earth's axis is tilted with respect to the plane of Earth's orbit and this axis maintains a position that changes little with respect to the background of stars . An observer on Earth therefore sees a solar path that is the result of both rotation and revolution. The component of the Sun's motion seen by an earthbound observer caused by the revolution of the tilted axis—which, keeping
1128-559: The Sun reaches the highest position in the sky once a year in June. The day this occurs is called the June solstice day. Similarly, for an observer on the South Pole , the Sun reaches the highest position on the December solstice day. When it is the summer solstice at one Pole, it is the winter solstice on the other. The Sun's westerly motion never ceases as Earth is continually in rotation. However,
1175-545: The Sun reaches the longitude of 285° (around 5 January). Dōngzhì more often refers in particular to the day when the Sun is exactly at the celestial longitude of 270°. The solstices (as well as the equinoxes ) mark the middle of the seasons in East Asian calendars. Here, the Chinese character 至 means "extreme", so the terms for the solstices directly signify the summits of summer and winter. The term solstice can also be used in
1222-527: The Sun's motion in declination (i.e. vertically) comes to a stop, before reversing, at the moment of solstice. In that sense, solstice means "sun-standing". This modern scientific word descends from a Latin scientific word in use in the late Roman Republic of the 1st century BC: solstitium . Pliny uses it a number of times in his Natural History with a similar meaning that it has today. It contains two Latin-language morphemes, sol , "sun", and -stitium , "stoppage". The Romans used "standing" to refer to
1269-429: The air above and surrounding sea. The warmest and coldest periods of the year in temperate regions are offset by about one month from the solstices, delayed by the earth's thermal inertia. The concept of the solstices was embedded in ancient Greek celestial navigation . As soon as they discovered that the Earth was spherical they devised the concept of the celestial sphere , an imaginary spherical surface rotating with
1316-404: The celestial sphere along the circumferences of circles in parallel planes perpendicular to the Earth's axis extended indefinitely into the heavens and intersecting the celestial sphere in a celestial pole. The Sun and the planets do not move in these parallel paths but along another circle, the ecliptic, whose plane is at an angle, the obliquity of the ecliptic , to the axis, bringing
1363-446: The central one is called "heliacal" ( hēliakos , "of the sun"). The term heliacal circle is used for the ecliptic, which is in the center of the zodiacal circle, conceived as a band including the noted constellations named on mythical themes. Other authors use Zodiac to mean ecliptic, which first appears in a gloss of unknown author in a passage of Cleomedes where he is explaining that the Moon
1410-415: The day when the Sun is exactly at the celestial longitude of 90°. Dōngzhì ( pīnyīn ) or Tōji ( rōmaji ) ( Chinese and Japanese : 冬至; Korean : 동지(Dongji) ; Vietnamese : Đông chí ; lit. winter's extreme ) is the 22nd solar term, and marks the winter solstice . It begins when the Sun reaches the celestial longitude of 270° (around 23 December) and ends when
1457-410: The equinox, the solstice time is not easy to determine. The changes in solar declination become smaller as the Sun gets closer to its maximum/minimum declination. The days before and after the solstice, the declination speed is less than 30 arcseconds per day which is less than 1 ⁄ 60 of the angular size of the Sun, or the equivalent to just 2 seconds of right ascension . This difference
Lourenço - Misplaced Pages Continue
1504-404: The halfway time between both noons is estimated solstice time. An interval of 45 days has been postulated as the best one to achieve up to a quarter-day precision, in the solstice determination. In 2012, the journal DIO found that accuracy of one or two hours with balanced errors can be attained by observing the Sun's equal altitudes about S = twenty degrees (or d = about 20 days) before and after
1551-410: The heavenly bodies ( ouranioi ) fixed in it (the modern one does not rotate, but the stars in it do). As long as no assumptions are made concerning the distances of those bodies from Earth or from each other, the sphere can be accepted as real and is in fact still in use. The Ancient Greeks use the term "ηλιοστάσιο" (heliostāsio) , meaning stand of the Sun . The stars move across the inner surface of
1598-455: The maximum elevation occurs at the summer solstice and the minimum at the winter solstice. The path of the Sun, or ecliptic , sweeps north and south between the northern and southern hemispheres. The lengths time when the sun is up are longer around the summer solstice and shorter around the winter solstice, except near the equator. When the Sun's path crosses the equator , the length of the nights at latitudes +L° and −L° are of equal length. This
1645-507: The months in which they take place every year. The word solstice is derived from the Latin sol ("sun") and sistere ("to stand still"), because at the solstices, the Sun's declination appears to "stand still"; that is, the seasonal movement of the Sun's daily path (as seen from Earth ) pauses at a northern or southern limit before reversing direction. For an observer at the North Pole ,
1692-567: The most popular tourist attraction is the Goiabal beach on the Atlantic Ocean , which is located 14 kilometers from the town of Calçoene. The beach is 4 kilometres long and the water is dark due to the influence of the Amazon. In May 2006, archeologists announced they had found a pre-colonial astronomical observatory , possibly 500 to 2,000 years old, near Calçoene. The age is based on pottery sherds on site that have been dated to 2,000 years old. The site
1739-711: The rites of Easter in most Christian churches, as well as the Wiccan Ostara . The autumnal equinox is associated with the Jewish holiday of Sukkot and the Wiccan Mabon . In the southern tip of South America , the Mapuche people celebrate We Tripantu (the New Year) a few days after the northern solstice, on 24 June. Further north, the Atacama people formerly celebrated this date with
1786-449: The same angle in space, is oriented toward or away from the Sun—is an observed daily increment (and lateral offset) of the elevation of the Sun at noon for approximately six months and observed daily decrement for the remaining six months. At maximum or minimum elevation, the relative yearly motion of the Sun perpendicular to the horizon stops and reverses direction. Outside of the tropics,
1833-600: The solar calendar. At one time, researchers did not think any cultures in the Amazon Basin had developed such complexity as to build such a site. This has altered their thinking. The municipality of Calçoene contains three districts: Solstice A solstice is the time when the Sun reaches its most northerly or southerly excursion relative to the celestial equator on the celestial sphere . Two solstices occur annually, around 20–22 June and 20–22 December. In many countries,
1880-403: The solstice without the use of more complex tools. Accounts do not survive but Greek astronomers must have used an approximation method based on interpolation, which is still used by some amateurs. This method consists of recording the declination angle at noon during some days before and after the solstice, trying to find two separate days with the same declination. When those two days are found,
1927-503: The start of Uttarayana and Karka Sankranti which marks the start of Dakshinayana . The former occurs around 14 January each year, while the latter occurs around 14 July each year. These mark the movement of the Sun along a sidereally fixed zodiac ( precession is ignored) into Makara, the zodiacal sign which corresponds with Capricorn , and into Karka, the zodiacal sign which corresponds with Cancer , respectively. The Amundsen–Scott South Pole Station celebrates every year on 21 June
Lourenço - Misplaced Pages Continue
1974-535: The subsolar point is further south than any other time: at latitude 23.44° south, known as the Tropic of Capricorn . The subsolar point will cross every latitude between these two extremes exactly twice per year. Also during the June solstice, places on the Arctic Circle (latitude 66.56° north) will see the Sun just on the horizon during midnight, and all places north of it will see the Sun above horizon for 24 hours. That
2021-418: The summer solstice because the average of the two times will be early by q arc minutes where q is (πe cosA)/3 times the square of S in degrees (e = earth orbit eccentricity, A = earth's perihelion or Sun's apogee), and the noise in the result will be about 41 hours divided by d if the eye's sharpness is taken as one arc minute. Astronomical almanacs define the solstices as the moments when the Sun passes through
2068-468: The winter and summer solstices, the equinoxes, and the midpoints between them, leading to various holidays arising around these events. During the southern or winter solstice , Christmas is the most widespread contemporary holiday, while Yalda , Saturnalia , Karachun , Hanukkah , Kwanzaa , and Yule are also celebrated around this time. In East Asian cultures, the Dongzhi Festival is celebrated on
2115-507: The winter solstice. For the northern or summer solstice , Christian cultures celebrate the feast of St. John from June 23 to 24 (see St. John's Eve , Ivan Kupala Day ), while Modern Pagans observe Midsummer, known as Litha among Wiccans . For the vernal (spring) equinox, several springtime festivals are celebrated, such as the Persian Nowruz , the observance in Judaism of Passover ,
2162-574: The year the Northern Hemisphere is inclined toward the Sun while for the other half year the Southern Hemisphere has this distinction. The two moments when the inclination of Earth's rotational axis has maximum effect are the solstices. At the June solstice the subsolar point is further north than any other time: at latitude 23.44° north, known as the Tropic of Cancer . Similarly at the December solstice
2209-473: Was a neutral territory. Paul Quartier had a meeting with the village chiefs of Cunani and Carsewenne (nowadays: Calçoene) in 1885. In 1886, the Republic of Independent Guiana was founded by a group of French adventurers and two village chiefs with Cunani as the capital. The unrecognised republic lasted until 1891. In 1900, the territory was awarded to Brazil. Calçoene became a municipality in 1956. Calçoene
#901098