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They have found that in every millennium the last sidereal day is approximately one-thousandth of a second longer than the first.
We divide this unit of time - the so-called sidereal day - into 24 hours, the hour into 60 minutes, the minute into 60 seconds.
Should we really consider two corresponding sections of the same scale as exactly equal to one another: two sidereal days, for example, as exactly equal intervals of time?
It also fixed the number of days in each month, which previously varied by year with the sidereal zodiac.
This approach has no effect upon those astrologers that utilize twelve equal sized ages based on the sidereal zodiac.
This is because the sidereal zodiac is superimposed upon the irregular zodiacal constellation, and there are no unambiguous boundaries of the zodiacal constellations.
Moon is said to have 27 (not 28) wives with whom he stays for one day in a sidereal lunar month.
It is 27.32158 days, very slightly shorter than the sidereal month (27.32166) days, because of precession of the equinoxes.
The true position of these stars is only approximate to their theoretical equidistant rhumbs on the sidereal compass.
Although there are 28 days to a sidereal month, by custom only 27 days are used, the last 28th day being considered unlucky.
A mean solar day is, therefore, nearly 4 minutes longer than a sidereal day.
By convention, rotation periods of planets are given in sidereal terms unless otherwise specified.
The satellite traces the same analemma once each sidereal day.
The exact length has been variously defined either that of a solar day or of a sidereal day.
Such an orbit relative to the stars is called a sidereal year.
