A text-book of general astronomy : for colleges and scientific schools (1888)
Young, Charles A. (Charles Augustus), 1834-1908 · Boston ; London : Ginn & Company · leaf 183
there are none whichattain the elevation of the very highest terrestrial mountains. Heightsranging from 10,000 to 20,000 feet are common. 271. The Best Time to look at the Moon with a Telescope. —Themoon when full is not so satisfactory an object as when near the half, be-cause at the full moon… … Fig. 89.Measurement of the Height of a Lunar Mountain. LUNAR PHOTOGRAPHS. 171 rays. Generally, any particular mountain, crater, rill, or cleft, is best studiedwhen it is just on or very near the terminator, that is, at the time when thesun is rising or setting near it, because then the shadows are…
Astronomy
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