A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 29
indicates a revolution of the eartharound the sun ? How does the sun appear to move ? What does this prove ?21. What is the ecliptic? The equinoctial? At what angle do these circles crosseach other ? What is this angle called ? What does this prove ? 4 m TUB EARTH. the earth every year is called… … P°LE OF ECLIPTIC determines that the ecliptic crosses the equinoctial,making with it an angle of 23± degrees. This is calledthe Obliquity of the Ecliptic, and proves to us that theearths axis is inclined to the plane of its orbit, that is,the path in which it may be conceived to revolve aroundthe…
Astronomy
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