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
PEEPENDICXTLAB PLANES.Fig. 15. … PLANES OF GEEAT CIECLES. Questions.—33. What is the radius f 34. How are circles of the sphere divided \85. What are great circles ? 36. Small circles ? 37. Poles of a circle ? a. Poles of agreat circle ? b. When are circles of the sphere parallel ? c. When perpendicular ?d. What is meant by the…
Astronomy
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