A compendium of astronomy; containing the elements of the science, familiarly explained and illustrated, with the latest discoveries. Adapted to the use of schools and academies, and of the general reader (1850)
Olmsted, Denison, 1791-1859 · New York, R. B. Collins · leaf 74
twostars may be, and however the plane which passesthrough them may be inclined to the horizon, still it istheir angular distance measured on the horizon whichdetermines their difference of azimuth. Figure 13 rep-resents an Altitude and Azimuth Instrument, several ofthe usual appendages and… … a horizontal axis and capable of two motions, one m al-titude parallel to the circle abc, and the other in azimuthparallel to EFG. Hence it can be easily brought to 6 62 THE EARTH. bear upon any object. At m, under the eye glass of thetelescope, is a small mirror placed at an angle of 45°with the…
Astronomy
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