| Sidereal Day |
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Information AboutSidereal Day |
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| units of time | |
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An apparent sidereal day is the time it takes for the s, 56 Minute s, 4.091 seconds). The reason there is one more sidereal day than "normal" days in a year is that the Earth's orbit around the Sun offsets one sidereal day, giving observers on Earth 365 1/4 days, even though the planet itself rotated 366 1/4 times (the Earth rotates in the same direction around its axis as it does around the Sun: seen from the northern sky, counter-clockwise). Midnight , in Sidereal Time , is when the First Point Of Aries crosses the upper meridian. A mean sidereal day is reckoned, not from the actual transit, but from the transit of the mean vernal equinox (see: Mean Sun ). SEE ALSO EXTERNAL LINK |
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