Right ascension is based on the apparent rotation of the sky as Earth spins — 360° in 24 hours, or 15° per hour. The concept dates at least from the time of Hipparchus (190-120 b.c.). Right ascension ...
The equatorial coordinate system projects Earth's latitude and longitude onto the celestial sphere, using declination (angular distance from the celestial equator, measured in degrees) and right ...
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