![]() ![]() Twelve important constellations are assigned to the zodiac, where the Sun, Moon, and planets all follow the ecliptic. Newer constellations in the far southern sky were added much later during 15th and mid-18th century, when European explorers began travelling to the southern hemisphere. In the northern hemisphere, the Western-traditional constellations were the forty-eight Greek classical patterns, as stated in both Aratus work known as the Phenomena or Ptolemy's Almagest - though their true existence probably predates these constellation names by several centuries. Many have varied in size or shape, while some becoming popular then dropping into obscurity, or others being traditionally used only by various cultures or single nations. Adoption of many constellations has significantly changed throughout the centuries. As such, different cultures and countries often adopted their own set of constellations outlines, some that persisted into the early 20th century. ![]() They are usually typified or embodies human-made constructions and often represent animals, mythological people or gods, mythological creatures, or manufactured devices.Ī true origin for the earliest constellations likely dates back to prehistory, whose unknown creators collectively used them to relate important stories of either their beliefs, experiences, creation, or mythology. Bottom: Contemporary map of Orion from the IAU and photography of the night skyĪ constellation is simply defined as a recognisable group of conspicuous stars that are placed together as imaginary patterns or outlines on the celestial sphere.Top: Baroque drawing of the constellation Orion from Johannes Hevelius ' Celestial catalogue. ![]()
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