This produces a value for the mean tropical year of 365.24219447.
3.
The table below shows the solar years of both systems in comparison with the actual mean tropical year.
4.
Another value,, is the product of the J1900.0 mean tropical year and the defined speed of light.
5.
The mean tropical year in 2000 was 365.24219 ephemeris days; each ephemeris day lasting 86, 400 SI seconds.
6.
Our calendar is based on the average time between vernal equinoxes, and this is not quite the same as the mean tropical year.
7.
As the average length of a Julian year is 365.25 days, the Julian year is almost 11 minutes longer than the mean tropical year.
8.
The Revised Julian calendar, as used in some Eastern Orthodox Churches, currently does a better job than the Gregorian in synchronizing with the mean tropical year.
9.
The duration of the " mean " calendar year of such a calendar approximates some form of the tropical year, usually either the mean tropical year or the vernal equinox year.
10.
Christopher Clavius, the architect of the Gregorian calendar, noted that the tables agreed neither on the time when the sun passed through the vernal equinox nor on the length of the mean tropical year.
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