A compendium of spherical astronomy with its applications to the determination and reduction of positions of the fixed stars (1906)
Newcomb, Simon, 1835-1909 · New York, The Macmillan company; London, Macmillan and co., ltd. · leaf 169
Fig. 15. When used without any other qualifying adjective, parallaxcommonly means the difference in the directions of a heavenlybody as seen from the point of reference, which may be thecentre of the earth or of the sun, and from some point ofobservation on the surface of the earth. … Fig. 16. Parallax in altitude is the difference between the geocentricand apparent altitude of a body. If in Fig. 16, P is the body,Q the point of observation, and 0 the centre of the earth, theparallax in altitude is the angle OPQ. If Q is so situated that the body is in its horizon, say at B,the…
Spherical astronomy · Stars
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