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Precession of the Equinox
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== What, When, How, Why == '''What:''' The Precession of the Equinox is a slow movement of the axis of a rotating body, specifically the Earth's axis, which alters the positions of the equinoxes over time. '''When:''' This process occurs over a cycle of approximately 26,000 years, also known as the [[Great Year]] or [[Platonic Year]]. '''How:''' The precession is caused by gravitational forces exerted by the Sun and the Moon on Earth's equatorial bulge, which gradually shifts the axis of rotation. '''Why:''' Understanding this phenomenon is crucial for astronomers and historians as it affects the apparent positions of the stars and constellations over millennia, influencing ancient calendars and modern astronomical observations.
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