Also, the mean solar day is getting longer at a rate of about 1.5 ms per century.
12.
Earth orbits the Sun at an average distance of about every 365.2564 mean solar days, or one sidereal year.
13.
The length of the mean solar day in SI seconds is available from the IERS for the periods 1623 2005 and 1962 2005.
14.
As a result, the SI second is close to 1 / 86400 of a mean solar day in the mid 19th century.
15.
The present " vernal equinox " year, however, is about 12 seconds longer, in terms of mean solar days.
16.
It accounts for the grand total of the extra length ( about 2 milliseconds each ) of all the mean solar days since the previous leap second.
17.
Earth's rotation period relative to the Sun ( its mean solar day ) consists of 86, 400 seconds of mean solar time, by definition.
18.
The present era lunar synodic period is about 29.5305877 mean solar days or about 29 days 12 hours 44 minutes and 2 + 7 / 9 seconds.
19.
In earlier centuries, the mean solar day was shorter than 86, 400 SI seconds, and in more recent centuries it is longer than 86, 400 seconds.
20.
However, because the mean solar day is slightly longer than 86, 400 SI seconds, occasionally the last minute of a UTC day is adjusted to have 61 seconds.
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