Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 130
orbit, and,furthermore, her axis of revolution must be nearly perpen-dicular to the plane of her orbit. More accurate observations show that the plane of themoons equator intersects the plane of her orbit in a linethat is parallel to the line of nodes. A plane passingthrough this line and parallel… … THE MOOS. 125 the moons equator makes an angle of 6£° with the plane ofher orbit. Explanation. The plane of thepamper is supposed to be perpendicu-lar to the ecliptic and to the moonsorbit. N is the projection of the lineof nodes; NC is the projection of theecliptic ; NO is the projection of…
Astronomy
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