Thus the rete rotated once in 365 / 366 of a mean solar day, which equated 366 successive meridian transits of the vernal equinox with 365 similar transits of the sun.
22.
All of these factors cause the mean solar day, on the average, to be slightly longer than the nominal 86, 400 SI seconds, the traditional number of seconds per day.
23.
However, for the past several centuries, the length of the mean solar day has been increasing by about 1.4 1.7 ms per century, depending on the averaging time.
24.
If instead of mean solar day we use the sidereal year as our time unit, the value of is very close to 2 [ [ pi | ] ] ( = } } ).
25.
A mean solar day ( what we normally measure as a " day " ) is the average time between local solar noons ( " average " since this varies slightly over the year ).
26.
The Analemma was devised as a means of calculating deviations in the actual day from the mean solar day .-- 32 " "'14 : 58, 25 November 2010 ( UTC)
27.
However, the duration of one mean solar day is now slightly longer ( by roughly 0.001 seconds ) than 24 hours ( 86400 SI seconds ) because the rotation of the Earth has slowed down.
28.
Near the end of the 20th century, the length of the mean solar day ( also known simply as " length of day " or " LOD " ) was approximately 86, 400.0013 s.
29.
Its average duration is mean solar days ( 365 d 6 h 9 min 9.76 s ) ( at the epoch J2000.0 = January 1, 2000, 12 : 00 : 00 TT ).
30.
A key development in understanding the tropical year over long periods of time is the discovery that the rate of rotation of the earth, or equivalently, the length of the mean solar day, is not constant.
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