Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 124
lythe two bodies reached their present condition. It can furtherbe shown that the effect of tidal action would be to slow downthe period of rotation of each body on its axis until this periodbecame equal to the period of rotation of the bodies the oneabout the other. In the case of the Moon, as we… … Mount inr^on Observatory. Portion of Moon round Mare Nueium. THE MOON 107 continue and, if the theory is correct, the last stage ofequilibrium of the Earth-Moon system will be one in whichthe terrestrial day and the lunar sidereal day will each beequal to the period of revolution of the two bodies…
Astronomy
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