Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 99
of light. This value, which hasrecently been found to be equal to 20.49, is sometimes called theconstant of aberration. Explanation. Same as before, except that the direc-tion of light is inclined to that of the observers motionin an angle EAD denoted by I, equal to I. In Fig. 40, the angle CDO is… … 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…
Astronomy
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