Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 94
observed ; C is thecentre of the earth; Z is the zenith of O,and ZOM, equal to z, is the observedzenith distance of M ; and OMC, equal top, is the geocentric parallax of M. In Fig. 36 the body M asseen from 0 appears to lie inthe direction OM, but if seenfrom C it would appear to bein the direction… … Fig. 36. Geocentric Parallax. 90 ASTRONOMY. body seen from the surface of the earth is greater than itwould be if seen from the centre, the difference being equalto its geocentric parallax. The geocentric parallax of a body depends upon its apparent zenithdistance, and also upon its actual distance…
Astronomy
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