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 81
ght. When it isin either of the equinoxes,the days and nights are of equal length in all parts of the earth, except at, or very near, the poles. 116. The atmosphere of the earth increases the length of the day, both by refracting and by reflecting the suns rays. Questions—113. What are the polar… … EARTH AT THE SOLSTICE. TWILIGHT. 77 a. When the sun is in eitherof the equinoxes, one half of itwould constantly appear above thehorizon of a place at either of thepoles, except for refraction, theeffect of which is very great atthose points; so that the sun, atthe equinox, appears wholly abovethe…
Astronomy
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