The young astronomer; or, The facts developed by modern astronomy, collected for the use of schools and the general reader (1847)
Abbott, John S. C. (John Stevens Cabot), 1805-1877 · New York, J.C. Riker [etc.] · leaf 53
o us, travelling at the rate of twenty miles an hour ? How longwould it take when Mars is farthest from us ? 48 THE YOUNG ASTRONOMER. sand years. When the Sun and Mars are on the sameside of the Earth, Mars is said to be in conjunction.When the Earth is between Mars and the Sun, Mars is… … Mars performs its annual revolution around the Sunin six hundred and eighty days. Thus a year on theplanet Mars is equal to about two years on the Earth. When is Mars said to be in conjunction ? When in opposition ?When are Mars and the Earth nearest together ? How much largerdoes Mars appear when…
Astronomy
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