1440m. :: 10 : 6 m. 29 s. Now if observation gave more than 6 minutes and 29 sec-onds, we shall conclude that the parallactic angle was morethan 10; if less, less. But this is an abstract proposition.When treating of an actual case in place of the mean motion,we must take the actual angular motions… … Venus, at its mean rate, passes -The earth, SOLAR PARALLAX. 125 earth and the center of the sun; and then by comparing the Chap. ix.local time of observation made at A, with the time at G, andreferring both to one and the same meridian, and we have theinterval of time occupied by the planet in…
Astronomy
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