diameters, because the same error of obser-vation on longitude, would not be as proportionally great ason apparent diameter. Let E be the eccentricity of the orbit; then (1—E) isthe least distance to the sun, and (l-\-E) the greatest dis-tance. Then, by observation, we have (1—E)2 : (1+Ef-Or, (1—Ey… … Chap. Ill, sun appears exactly inthe opposite position,and every raotionmade by the earthmust correspond to anapparent motion madeby the sun. But, for the purposeof getting nearer tofact, we will now sup-pose the earth revolves round the sun in an elliptical orbit,as represented by Fig. 18. We have…
Astronomy
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