A new manual of the elements of astronomy, descriptive and mathematical .. (1868)
Kiddle, Henry, 1824-1891 · New York, Ivison, Phinney, Blakeman & co.; Chicago, S.C. Griggs & co. · leaf 55
the equator, and the plane of anyone of them would divide the earth into easternand western hemispheres. A great circle thatis perpendicular to another is sometimes calleda secondary to it. Thus the meridian circlesare secondaries to the equator. 69. The position of a place on the surface of the… … Qxtestions.—66. What are the poles ? a. What are the celestial poles ? 67. What isthe equator? 68. What are meridian circles? Meridians? a.. Their relation to theequator ? What is a secondary ? 69. What is latitude ? Longitude ?
Astronomy
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