Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · Cambridge, University press · leaf 376
sir, but equation (2) shows that cos 6 is very small,, or that 6 is nearly 90°, and hence as x is small we have very nearly sc = -!ro —'TTo + n + rQ. The quantities in this expression are of course variable and for their values from day to day reference must be made to the epheraeris. 122.… … Fig. 89. Let S2 and M,, and S^ and M^ represent the centres of the sun and moon as similarly presented at two later stages. To an observer in the position we have supposed and under the circumstances represented in the figure the moon would evidently pass quite clear of the sun and there would be…
Spherical astronomy
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