Abstract
Just like the axis of a rotating top, the axis of the Earth moves in a conical path about the ecliptic pole and completes it in about 25800 years. This motion of the Earth is known as precession. Due to this precessional motion, the equinoctial points experience a westward motion and hence the cardinal points shift their positions with the passage of time. In this article, the causes of precessional motion and its effect on calendar preparation are discussed.
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