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 20
the sphere, equally dis-tant from the circumference ofthe circle. a. The poles of a great circle are, ofcourse, 90° distant from every pointof its circumference. b. Two circles of the sphere are par-allel when they are equally distant from eachother at every point. c. Two circles are perpendicular… … PEEPENDICXTLAB PLANES.Fig. 15.
Astronomy
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