The Royal observatory, Greenwich. A glance at its history and work (1900)
Maunder, E. Walter (Edward Walter), 1851-1928 · London, The Religious tract society · leaf 211
to determine, not the declination and right ascen-sion of some celestial body, as is the case with thetransit circle, but its altitude, i.e. its height above thehorizon, and its azimuth, i.e. the angle measured on 208 THE ROYAL OBSERVATORY the horizontal plane from the north point. Thealtazimuth,… … AIRYS ALTAZIMUTH. not merely due north and south, but in any directionwhatsoever. The observations with the altazimuth are rathermore complicated than those with the transit circle. THE ALTAZIMUTH DEPARTMENT 209 Looking in the telescope, the observer sees a doubleset of spider threads or wires; and…
Royal Greenwich Observatory · Astronomy
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