Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 186
y, describingthe circumference of the ecliptic in a year. It is easyto demonstrate that the effect on each particular starwill be to make it apparently describe a small ellipsein the heavens, having for its centre the point in whichthe star would be seen if the earth were at rest. (281.) Aberration… … the visual ray. If S B bethe true direction of thevisual ray, and A C the posi-tion in which the telescoperequires to be held in theapparent direction, we muststill have the proportionBC : BA :: velocity of n 2 ~ 180 A TREATISE ON ASTRONOMY- CHAP. IV. ring at the same time the corrections for…
Astronomy
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