Willson, Robert Wheeler, 1853-1922 · Boston, New York Ginn & company · leaf 78
this point is most simply fixedby its distance in degrees from the ascending node of the moonsorbit. Since the latter point, however, is continually changing,it is customary to reckon the so-called longitude in the orbit ofthe point by measuring from the vernal equinox along the eclipticto the… … the results obtained from the investigation of the angular velocityin the orbit, since we thus gain some knowledge of the moonsrelative distances from us at different points of its orbit, and of therelation between its distance and its rate of motion about the earth.The scale of the 6-inch globe is…
Astronomy
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