Current, Year, would, Calendar, Used, Gregorian, sidereal


Question by whitsox:

What would the current year be if the Gregorian calendar used the sidereal year?

I learned this in astronomy. A tropical year is Earth's full orbital period around the sun. A sidereal year is the the time it takes Earth to orbit the Sun with respect to the stars. So if the Gregorian calendar used the sidereal, what would the current year be?




Best answer:

Answer by bikenbeer2000
The Sidereal Year is about 20 minutes longer than the Tropical Year. If we take the starting date of 1582 for the Gregorian calendar, the accumulated difference over the 417 year interval until now would be 417 x 20 minutes, which is about 139 hours or almost 6 days. Thus it would still be the same year, but the date would be November 4th instead of November 10th.
The Tropical Year is defined by the position of the Earth's axis, which rotates due to precession once every 25,800 years. It would therefore take 25,800 years before the sidereal calendar differed by 1 year from the tropical calendar.

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