Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 230
r. J. R.Hind 7 What is the density of Mars 7 The mass ? 19* 222 SOLAR SYSTEM. 484. Intensity of solar light. The relative intensi-ties of the solar light at Mars and at the earth, as foundby the rule already given (Art. 439,) arerepiesented bythe numbers 43 and 100. To illustrate, if on a… … MARS AS SEEN BY SIR JOHN HERSCHEL. telescope, on the 16th of August, 1830. It shows theplanet in its gibbous state, with the outlines of its conti-nents and seas; while one of the white spots which aresituated near its poles is distinctly discernable on itssurface. THE ASTEROIDS. 486. The…
Astronomy
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