2/22/2023 0 Comments Star chart astronomy![]() ![]() Any given point in a celestial coordinate system lies in one of the modern constellations. In 1922, the International Astronomical Union (IAU) formally accepted the modern list of 88 constellations, and in 1928 adopted official constellation boundaries that together cover the entire celestial sphere. 400 BC in Babylonian or Chaldean astronomy. The origins of the zodiac remain historically uncertain its astrological divisions became prominent c. ![]() Twelve (or thirteen) ancient constellations belong to the zodiac (straddling the ecliptic, which the Sun, Moon, and planets all traverse). Constellations in the far southern sky were added from the 15th century until the mid-18th century when European explorers began traveling to the Southern Hemisphere. They are given in Aratus' work Phenomena and Ptolemy's Almagest, though their origin probably predates these works by several centuries. The 48 traditional Western constellations are Greek. Some were limited to a single culture or nation. Some became popular, only to drop into obscurity. The recognition of constellations has changed significantly over time. Different cultures and countries adopted their own constellations, some of which lasted into the early 20th century before today's constellations were internationally recognized. People used them to relate stories of their beliefs, experiences, creation, or mythology. The origins of the earliest constellations likely go back to prehistory. Bottom: Contemporary map of Orion from the IAU and photograph of the night sky with drawn linesĪ 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.Top: Baroque drawing of the constellation Orion from Johannes Hevelius ' Celestial catalogue, showing the stars as they would appear to an observer looking down upon the imaginary celestial sphere from the outside.Three views of the constellation Orion: the old Baroque mythological figure, a modern stick figure, and a photo of the stars themselves. ![]()
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