Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 129
ing and which is, ofcourse, a point on the ecliptic900 from the sun. Let us sup-pose that there is a star, situ-ated in the direction indicatedby the line p s. In a quarterof a year after the earth wasat p it will have reached theposition a, and the telescopeis again pointed to the samestar. Now if… … Aberration of Light. in in a somewhat different direction, a b. It followsthat the angle cba will be equal to the difference be-tween 1800 and the angle which the star makes withthe sun, and hence the angle cba is known. Thisangle c b a is the difference between the real directionof the star and…
Astronomy
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