Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 257
Fig. 76. — Outline map of the moon. For example, in Fig. 77 the crater Theophilus is a littlebelow the center, and in its interior are three lofty moun-tains whose sharp, spirelike shadows stretch off to the left.Since the size of the moon and the scale of the photographare both known, the lengths… … Fig. 77. — The crater Theophilus and surrounding region (Ritohey). determined. There is also no difficulty in finding the heightof the sun in the sky as seen from this position on the moonwhen the picture was taken. Consequently, it is possiblefrom these data to compute the height of the mountains.…
Astronomy
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