Electro astronomical atlas ... with explanatory notes, questions and answers (1874)
Spoor, J. W. (Joseph W.) · Albany, N.Y., Weed, Parsons and Company · leaf 45
ne of hisorbit to the plane of the Ecliptic ? A. Seven degrees. Q. What is the inclination of its axis to theplane of its orbit % A. Seven and one-third degrees. Q. How long does it take Mercury to turn onits axis ? A. Twenty-four hours and six minutes. Q. What does this indicate % A. The length of… … ELECTRO-ASTRONOMICAL ATLAS. 27 Let us speak first of from henceforward its form. Mercury, in . >v characterizes it more the course of one of ^ * X \ and more, until it is its oscillations, pre- ••> ) ) only visible as a fine sents phases entirely luminous thread. analogous to those oi ^* We…
Astronomy
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