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A constellation is an area on the celestial sphere in which a group of visible stars forms a perceived pattern or outline, typically representing an animal, mythological subject, or inanimate object. [ 1] The first constellations likely go back to prehistory. People used them to relate stories of their beliefs, experiences, creation, mythology.
IAU designated constellations in equirectangular projection (epoch B1875.0) In contemporary astronomy, 88 constellations are recognized by the International Astronomical Union (IAU). [ 1] Each constellation is a region of the sky bordered by arcs of right ascension and declination, together covering the entire celestial sphere.
All stars but one can be associated with an IAU (International Astronomical Union) constellation. IAU constellations are areas of the sky. Although there are only 88 IAU constellations, the sky is actually divided into 89 irregularly shaped boxes as the constellation Serpens is split into two separate sections, Serpens Caput (the snake's head) to the west and Serpens Cauda (the snake's tail ...
Star chart. A celestial map by the Dutch cartographer Frederik de Wit, 1670. A star chart is a celestial map of the night sky with astronomical objects laid out on a grid system. They are used to identify and locate constellations, stars, nebulae, galaxies, and planets. [ 1] They have been used for human navigation since time immemorial. [ 2]
Click on to see large image. Orion is a prominent set of stars visible during winter in the northern celestial hemisphere. It is one of the 88 modern constellations; it was among the 48 constellations listed by the 2nd-century astronomer Ptolemy. It is named after a hunter in Greek mythology .
The following lists of constellations are available: IAU designated constellations – a list of the current, or "modern", constellations. Former constellations – a list of former constellations. Chinese constellations – traditional Chinese astronomy constellations.
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