Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 127
can come out of the eye piece. When thetelescope is in the position A b the light enters thetelescope through the object glass at b; the motion ofthe telescope is then sufficient to enable the light topass down the tube of the telescope without beinglost against the sides, and when the telescope… … Aberration of Light. 109 sition of the star, he will see the star in the directionx y in which the telescope is pointed, and. therefore,he will judge erroneously of the position of the star toan extent which is measured by the angle between thedirection s x of the rays which come from the star…
Astronomy
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