The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 122
after passingthrough the glass, begin to con-verge towards a fixed point inspace, with which, at this instant,the intersection of the cross-wiresFig. 49. coincides. Let the earth be moving in the direction FA. Since the transmission of light is notinstantaneous, time is required for the light to… … ABEBjBATION. 117 is enfirely independent of any motion of the telescope, will tendto meet at the point jP. In order, then, to have the image of thestar coincide with the intersection of the wires, the telescopemust be so moved that its axis will lie in the position OF. Thestar will then appear to…
Astronomy
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