Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 87
rtion only of the brightsurface i.s turned towards us, and thus are produced the 72 Star-Land. beautiful crescents and semi-circles and other phases of themoon. We have here a simple apparatus (Fig. 27) which willexplain their various appearances. The large india-rubberball there shown represents… … Fig. 27.—To show that the Moon is lighted by Sunbeams. the bright side. To you the moon is nearly full. From thecentre of the room you see the moon like a semi-circle, andfrom the left it appears a thin crescent of light. I alter theposition of the ball with respect to the lamp, and now yousee the…
Astronomy
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