The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 95
rection of the sun. The small arrows indicate the direc-tion of the rotation andrevolution of the earth. Inpassing from the first posi-tion to the second theearth makes a completerotation, but the meridianis not brought up to thesun. 80. Tneqiiality in theLcngtli of So/a?- Days. —The sidereal days… … There are three reasons why this rate is variable: (i) The suns eastward motion isdue to the revolution of the earthin its orbit. Now, the earths orbitalmotion is not nniforni, being fast-est when the eartli is at perihelion,and slowest when the earth is ataphelion : hence, other things beingequal,…
Astronomy
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