Electro astronomical atlas ... with explanatory notes, questions and answers (1874)
Spoor, J. W. (Joseph W.) · Albany, N.Y., Weed, Parsons and Company · leaf 49
superior conjunc-tion?A. One hundred and(schroeter.) thirty-two million miles. Q. What months are most favorable for ob-serving this planet ? A. In the monthsof March or April,and in August or Sep-tember, when its great-est elongation hap-pens. Q. Why is it not easily seen in winter ? A. On account… … and sunset. Q. Why can it not be seen in summer ? A. The long twilight prevents our seeing anysmall object in the heavens. The great proximity of Mercury to the solarrays renders the observation of the planet some- what difficult; very little, therefore, is known ofits surface. One diligent…
Astronomy
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