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 98
ts orbit,and 2 the positionto which it advancesduring one day; P,the place at whichthe sun is on themeridian at 1; P,the same place afterone complete rota-tion, as shown bythe parallel P S.It will be evidentthat in order tobring P under themeridian, so thatthe sun may appearto cross it, the… … Questions.—134. What is a solar day ? a. Why are the solar days longer than thesidereal ? Explain by the diagram. 135. What is the average difference ? 94 TIME. 136. Owing to the variable motion of the earth in itsorbit, and the obliquity of the ecliptic, this difference is notthe same throughout…
Astronomy
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