Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 100
we have, from (2) a = 20.49 sin I (3) Hence, the general value of aberration varies as the sine of the incli-nation of the direction of light to the direction of the observers motion. When the observer is moving directly toward or directly from abody the aberration is zero ; when he is moving at… … motion of light the aberration is 20.49 ; in all other cases the aberra-tion lies between these limits. Explanation. S is the sun ; ACDF is theorhit of the earth ; s is a star at the pole of theecliptic ; and acdf is the annual curve of aber-ration. In Fig. 41, let s be the true place ofa star, at…
Astronomy
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