aced from theposition which it would haye if it traveled alone aroundthe sun. This displacement will appear in the observedposition of the sun.and can be calculated. It has been foundto be 61 seconds of arc; and from this it results that theearths mass is 811 times that of the moon. Hence them:ons… … Pig. 1.—THE CRATER OF PLATO. The moons path around the earth would always be an oval of exactly the same dimensions if the earth alone acted u 1 on it; but owing to the attraction of the sun, the moon is sometimes in advance and sometimes behind the place she cent, and marble 50 per cent. Sir John…
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