The mean tropical year in 2000 was 365.24219 ephemeris days; each ephemeris day lasting 86, 400 SI seconds.
2.
The mean tropical year in 2000 was 365.24219 ephemeris days; each ephemeris day lasting 86, 400 SI seconds.
3.
Where the time variable, here represented as E, now represents time in ephemeris centuries of 36525 ephemeris days of 86400 ephemeris seconds.
4.
In the Syst�me International ( SI ), the length of day during the late 19th century was used to define the second . ( See ?T . ) In recent decades, the length of a solar day has usually been a couple milliseconds more than an ephemeris day.
5.
Note that the above formulae give the length of the tropical year in ephemeris days ( equal to 86, 400 SI seconds ), not solar days . It is the number of solar days in a tropical year that is important for keeping the calendar in synch with the seasons ( see below ).
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