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 46
1 52. The Axis of a planet is the imaginary straight linepassing through its centre, on which we conceive it torotate. 53. A planet must rotate with its axis either perpen-dicular or oblique to the plane of its orbit. The axes of theplanets are all considerably oblique, excepting that of Jupi-ter,…
Astronomy
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