Electro astronomical atlas ... with explanatory notes, questions and answers (1874)
Spoor, J. W. (Joseph W.) · Albany, N.Y., Weed, Parsons and Company · leaf 77
alled New Moon — When Full Moon — Relation to the Earth — Satellite—Time of Revolutions—What Called—HovNear the Earth — Revolutions in a Year — Synodic and Siderial Revolution, The Siderial revolu-tion of the Moon aroundthe Earth is accom-plished in about twenty-seven and a third days,but, owing to… … The wave-like motionof the Moon, by whichit crosses the path ofthe Earth twice eachmonth is produced bya combination of itsown peculiar motionsand the onward move-ment of the Earth. Asthe same side of theMoon is kept constantlytoward us, it is evidentthat it must turn on itsaxis once each month.…
Astronomy
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