![]() The rotation axis is moving in a circle with a period of roughly 26,000 years (precession). The Earth is rotating on its axis once every siderial day. A few of the important motions and effects are summarized below. – The coordinates Right Ascension (RA) and Declination (DEC) will be used frequently here.Look at the GIF to know what is RA and DEC.The positions of objects in the sky as viewed from Earth are referred to a coordinate system whose alignment is changing with time in a complex way. – An Integer (Julian Day No.) that would give the day number count from the beginning of Julian year which will help us locating the planets/celestial bodies in their orbits for a particular date and time relative to a particular date.
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