An introduction to astronomy : designed as a text book for the students of Yale College (1846)
Olmsted, Denison, 1791-1859, Yale College (1718-1887) · New York : Collins, Brother & Co. · leaf 108
tation of eclipses. The amount of illumination also is increased by refraction. THE SEASONS. 83 tion passes through both the poles. When the earth reaches oneof the tropics, the sun being at the other, the circle of illumina-tion cuts the earth so as to pass 23° 28 beyond the nearer, andthe same… … Let ABCD represent the earths place in different parts of itsorbit, having the sun in the center. Let A, C, be the position ofthe earth at the equinoxes, and B, D, its positions at the tropics,the axis ns being always parallel to itself* At A and C the sunshines on both n and s; and now let the…
Astronomy
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