Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 93
. parallel with its position at i ; but it is evident that themeridian has not yet come up with the sun. In Fig. 91,OA represents the plane of the meridian, and OS thedirection of the sun. The small arrows indicate the direc-tion of the rotation andrevolution of the earth. Inpassing from the first… … Fig. 92. solar days differ somewhat in length. This difference is dueto the fact that the suns apparent position moves eastward,or a7vay from the meridian, at a variable rate. There are three reasons why this rate is variable: — (1) The suns eastward motion isdue to the revolution of the earthin…
Astronomy
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