new moon, the lunarians have full earth; and when we have first quarter, they have last quarter, etc. The moon appears, to us, about half a degree in diameter; the earth appears, to them, a moon, about Fig. 16. diameter ofthe ea r t h(Fig. 16), withat of themoon, D thedistance be-tween the two… … From the first, D= E tan.i> from the 2d, D= m tan. s Therefore,6 E m m tan. P tan. $ or tan. s tan. P E Q. E.D. revolves onan axis 72 ASTRONOMY. Chap. ii. two degrees in diameter, invariably fixed in their shy, and thestars passing slowly behind it. The moon But, says Sir John Herschel, the…
Astronomy
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