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 54
h. 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 in opposition than when in conjunction ? Inwhat time does Mars perform its revolution around the Sun ? Howlong is a year on Mars : MARS. 49 It revolves… … about one-third of its surface is water. It is also evi-dent that Mars is surrounded wTith a very dense atmo-sphere, in which clouds are occasionally seen floating.A variety of seasons must also exist upon this planet,somewhat similar to ours. In the winter, the northernregions of Mars are whitened…
Astronomy
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