Astronomy for schools; upon the basis of Mons. Arago's lectures at the Royal observatory of Paris .. (1841)
Arago, F. (François), 1786-1853, Haskins, Roswell William, [from old catalog] ed · New York, Robinson, Pratt & co.; · leaf 268
ve the sameduration, in all parts of the earth; but the inclinationof these two planes is 23° 28: and it is this inclinationwhich produces the diversity of seasons, and of days. It is easy to comprehend the nature and varietywhich the phenomena of day and night present, upondifferent points of the… … and E e the equator. Whenthe sun, S, is in the plane ofthe equator, it will describethe circle E e, which the ho-rizon, H A, divides into twoequal parts, thus giving thesun an equal time above andbelow the horizon, and there-fore causing the days andnights to be of equal length.But when the sun…
Astronomy
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