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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]
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; List of Nakshatras – sectors along the Moon's ecliptic
The formation of constellations was the subject of extensive mythology, most notably in the Metamorphoses of the Latin poet Ovid. 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. Due to Roman and European transmission, each ...
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. Their boundaries ...
Gemini is one of the constellations of the zodiac and is located in the northern celestial hemisphere.It was one of the 48 constellations described by the 2nd century AD astronomer Ptolemy, and it remains one of the 88 modern constellations today.
In Western astronomy, Monoceros is a relatively modern constellation, not one of Ptolemy's 48 in the Almagest. [10] Its first certain appearance was on a globe created by the cartographer Petrus Plancius in 1612 or 1613 [11] and it was later charted by German astronomer Jakob Bartsch as Unicornu on his star chart of 1624. [12]
It is one of the 48 constellations described by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations. It is a mid-sized constellation ranking 39th in overall size, with an area of 441 square degrees (1.1% of the celestial sphere). Aries has represented a ram since late Babylonian times.
Somewhere around the 5th century BCE, Babylonian astronomical texts began to describe the positions of the Sun, Moon, and planets in terms of 12 equally-spaced signs, each one associated with a zodiacal constellation, each divided into 30 degrees (uš). This normalized zodiac is fixed to the stars and totals 360 degrees.
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