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What (who) is astronomy$5561$ - definition
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![seven planets]] on 18 March 816, from the [[Leiden Aratea]]](https://commons.wikimedia.org/wiki/Special:FilePath/Aratea 93v.jpg?width=200 "seven planets]] on 18 March 816, from the [[Leiden Aratea]]")
![Arabic [[astrolabe]] from 1079-80 AD](https://commons.wikimedia.org/wiki/Special:FilePath/Astolabio di ahmad ibn muhammad al-naqqash, ottone inciso, saragozza, 1079-1080.JPG?width=200 "Arabic [[astrolabe]] from 1079-80 AD")
![Babylonian tablet in the [[British Museum]] recording [[Halley's comet]] in 164 BC](https://commons.wikimedia.org/wiki/Special:FilePath/Babylonian tablet recording Halley's comet.jpg?width=200 "Babylonian tablet in the [[British Museum]] recording [[Halley's comet]] in 164 BC")
![Calendrical functions of the [[Berlin Gold Hat]] c. 1000 BC](https://commons.wikimedia.org/wiki/Special:FilePath/Berlin Gold hat calendar.jpg?width=200 "Calendrical functions of the [[Berlin Gold Hat]] c. 1000 BC")
!["El Caracol" observatory temple at [[Chichen Itza]], [[Mexico]]](https://commons.wikimedia.org/wiki/Special:FilePath/Chichen Itza Observatory 2 1.jpg?width=200 "\"El Caracol\" observatory temple at [[Chichen Itza]], [[Mexico]]")
![Fondachelli Fantina]], [[Sicily]]](https://commons.wikimedia.org/wiki/Special:FilePath/Equinozio da Pizzo Vento,tramonto fondachelli fantina, sicilia.JPG?width=200 "Fondachelli Fantina]], [[Sicily]]")
![[[Hubble Space Telescope]]](https://commons.wikimedia.org/wiki/Special:FilePath/Hubble 01 Cropped.jpg?width=200 "[[Hubble Space Telescope]]")
![[[Southern Hemisphere]]](https://commons.wikimedia.org/wiki/Special:FilePath/Ioannis Bayeri Rhainani Vranometria 1661 (84132460).jpg?width=200 "[[Southern Hemisphere]]")
![Jantar Mantar]] observatory in [[Jaipur]], India](https://commons.wikimedia.org/wiki/Special:FilePath/Jantar Mantar at Jaipur.jpg?width=200 "Jantar Mantar]] observatory in [[Jaipur]], India")
![nucleus/bulge]], notable [[nebulae]] and [[globular clusters]]](https://commons.wikimedia.org/wiki/Special:FilePath/Milky way map.png?width=200 "nucleus/bulge]], notable [[nebulae]] and [[globular clusters]]")
![The [[Antikythera Mechanism]] was an [[analog computer]] from 150–100 BC designed to calculate the positions of astronomical objects.](https://commons.wikimedia.org/wiki/Special:FilePath/NAMA Machine d'Anticythère 1.jpg?width=200 "The [[Antikythera Mechanism]] was an [[analog computer]] from 150–100 BC designed to calculate the positions of astronomical objects.")
![The [[Nebra sky disk]], Germany, 1800 - 1600 BC](https://commons.wikimedia.org/wiki/Special:FilePath/Nebra disc 1.jpg?width=200 "The [[Nebra sky disk]], Germany, 1800 - 1600 BC")
![Planck]]'' documenting a progress in 1989–2013](https://commons.wikimedia.org/wiki/Special:FilePath/PIA16874-CobeWmapPlanckComparison-20130321.jpg?width=200 "Planck]]'' documenting a progress in 1989–2013")
![Segment of the [[astronomical ceiling of Senenmut's Tomb]] (circa 1479–1458 BCE), depicting constellations, protective deities, and twenty-four segmented wheels for the hours of the day and the months of the year](https://commons.wikimedia.org/wiki/Special:FilePath/Senenmut-Grab.JPG?width=200 "Segment of the [[astronomical ceiling of Senenmut's Tomb]] (circa 1479–1458 BCE), depicting constellations, protective deities, and twenty-four segmented wheels for the hours of the day and the months of the year")
Wikipedia
Spherical astronomy, or positional astronomy, is a branch of observational astronomy used to locate astronomical objects on the celestial sphere, as seen at a particular date, time, and location on Earth. It relies on the mathematical methods of spherical trigonometry and the measurements of astrometry.
This is the oldest branch of astronomy and dates back to antiquity. Observations of celestial objects have been, and continue to be, important for religious and astrological purposes, as well as for timekeeping and navigation. The science of actually measuring positions of celestial objects in the sky is known as astrometry.
The primary elements of spherical astronomy are celestial coordinate systems and time. The coordinates of objects on the sky are listed using the equatorial coordinate system, which is based on the projection of Earth's equator onto the celestial sphere. The position of an object in this system is given in terms of right ascension (α) and declination (δ). The latitude and local time can then be used to derive the position of the object in the horizontal coordinate system, consisting of the altitude and azimuth.
The coordinates of celestial objects such as stars and galaxies are tabulated in a star catalog, which gives the position for a particular year. However, the combined effects of axial precession and nutation will cause the coordinates to change slightly over time. The effects of these changes in Earth's motion are compensated by the periodic publication of revised catalogs.
To determine the position of the Sun and planets, an astronomical ephemeris (a table of values that gives the positions of astronomical objects in the sky at a given time) is used, which can then be converted into suitable real-world coordinates.
The unaided human eye can perceive about 6,000 stars, of which about half are below the horizon at any one time. On modern star charts, the celestial sphere is divided into 88 constellations. Every star lies within a constellation. Constellations are useful for navigation. Polaris lies nearly due north to an observer in the Northern Hemisphere. This pole star is always at a position nearly directly above the North Pole.
