![]() ![]() ![]() Thereafter, the difference increases until half a year later it is 12 hours (around March 23). GMT and Greenwich sidereal time coincide at one instant every year at the autumnal equinox (around September 22). ![]() ![]() (shorter by 3 min 55.91 seconds than the mean solar day of 24 hours.) Each sidereal day is thus :ĭuration of one sidereal day = Duration of sidereal year/No. If we look from remote stars, we see that the earth has made 366.2422 circles about its axis in 365.2422 days. During this period, the earth makes one revolution around the Sun. Such a clock is called a sidereal clock and its time, being regulated by stars is called sidereal time. We want to know the time period of earth when any star is observed to return to the same position. In astrology, we are interested in motion of stars. One Solar day is the time between two successive passages of the sun across the meridian as observed at a particular place. Attention is drawn towards the common error committed by most of the fellow astrologers in the computation of ascendant or planet degrees. Oral computation of ascendant is also described. In this lesson we are describing sidereal time and are listing the formulas to derive 10th house and ascendant degree accurately using sidereal time. ![]()
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