Gst

186.125 + 2 442 777.500 = 2 442 963.625 -2 415 020.000 27 943.625 0.765054757 6 610 214.340 sec = 76dl2h10ml4?340 6 38 45.836 3 0 0.000 21h49m OM76

Due primarily to the varying distances of the Sun and the Moon, a small amplitude oscillation, known as astronomical nutation, is superimposed on the precession of the equinoxes. Sidereal time corrected for this effect is called mean sidereal time. GST in Eqs. (J-4) and (J-5) is mean sidereal time. The maximum difference between mean and apparent sidereal time is only about I sec.

Table J-3. Julian Date at the Beginning of Each Year From 1975 to 2000

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