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 90
e of Apsides.—The line of apsides of theearths orbit does not always remain in the same position in space, butslowly moves toward the east, about llf every year ; hence, making acomplete circuit in about 110,000 years. But the equinoxes are movingthe other way about 50 every year (Art. 105 ), so… … !£!mc£ ■UNEQUAL LENGTH OF SEASONS. Questions.—b. What is the duration of each season ? Explain by the diagram.c. What motion has the line of apsides ? Its effect on the perhelion ? bb THE SEASONS. d. Length of the Seasons Variable.—The comparative length of theseasons is, therefore, not the same at…
Astronomy
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