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Show Know The Weather Do you know what side-real time is? SIDEREAL time, of which we hear little, is an accurate measurement of time. It's the measurement of time derived from observation of the meridian meri-dian transits of the stars and differs slightly from solar time. The mean sidereal day, for example is only 23 hours, 56 minutes and 4.09 seconds. The time required for the earth to make one complete revolution around the sun is the sidereal year. THE SIDEREAL year is 365 days, 6 hours, 9 minutes and 9.5 seconds. Every fourth year, as the reader knows, the extra hours-over and above the 365 days, are combined into an added day-in Leap Year. But the effect of this small time divergence has no noticeable bearing on our weather. |