Popular astronomy : a concise elementary treatise on the sun, planets, satellites and comets (1865)
Mitchel, O. M. (Ormsby MacKnight), 1809-1862 · New York : Oakley & Mason · leaf 37
,gives for a remainder the angle A B A, or the angleunder which the line A A would be seen by a spectatorat B. Now this angle, because of its minute value, maybe difficult to measure, and we desire to find some arti-fice by which this difficulty may be at least diminished, 84 THE SUN. if not… … D B B projected at B. Now let us suppose that the points Band B can be identified and seen as round, black, perma-nent spots on the remote surface C D; in case B is fur-ther from C D than from A A, it is clear that the visualangle subtended bj BB^, as seen from A, will be largerthan the visual…
Astronomy
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