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As our G.M.T. is Aug. 2, 1909, at 2:15 P. M., if we desire to calculate the daily motion of the Sun we note its longitudes on the noon of Aug. 2nd (the noon before G. M. T.) and Aug. 3rd (the noon after G. M. T.). As we are to subtract we place the longitude of the planet on the last day above, for that facilitates the operation.

Deg. Min.
The Sun’s longitude at noon on Aug. 3rd, 1909, (as given in the ephemeris)
10 28
The Sun’s longitude at noon Aug. 2nd
9 31
The motion of the Sun on the G. M. T. day 0 57

The next step is to find the interval between the G. M, T. and the nearest noon, for that is also a basis of our correction, In the present horoscope the G. M. T. is Aug. 2, 2:15 P.M. The nearest noon is obviously 12 o’clock August 2nd, and the interval between 12 o’clock noon and 2:15 P. M. is therefore 2 hours and 15 minutes.

The motion of the planet on the G. M. T. day and the interval from G. M. T. to nearest noon having been found, our problem may be thus stated:

When the Sun moves 57 minutes of space in 24 hours, how much does it move in 2 hours and 15 minutes? Answer: 5 minutes.

This method of working the corrections by simple proportion may be used with advantage where the motion of a planet is less than one degree; with Venus, Mereury, and particularly in the ease of the