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Old November 30th 17, 03:37 PM posted to sci.astro.amateur
Gerald Kelleher
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Default The Equation of Time(keeping)

It is because the Equation of Timekeeping sits inside the calendar framework, it points to the fact that after the 4 year cycle, the same set of values are not replicated even though the variations are minor. The Precession of the Equinoxes is a more refined version of the leap day correction as the Earth does not return exactly to the same orbital position from March 1st one year to February 29th four years later hence the orbital speed is slightly different when the new cycle begins.