Olmsted, Denison, 1791-1859. [from old catalog] · New York, R. B. Collins · leaf 98
ositesides of the sun to opposite sides of the earth, converge to a pointbehind the earth, as will be seen by and by in the representation ofeclipses THE SEASONS. 85 tropics, the sun being at the other, the circle of illumin-ation cuts the earth, so as to pass 23° 28 beyond thenearer, and the same… … Let ABCD represent the earths place in differentparts of its orbit, having the sun in the center. Let A, 116. How much of the earth does the sun enlighten at once ?Define the circle of illumination. How does it cut the earth atthe equinoxes ? How at the solstices 1 Explain figure 22.When the earth…
Astronomy
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