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 80
horizon while oroing south fromn to W, the winter solstice, and north from W to m, where it again crossesthe eircle of perpetual occultation, and then appears once more above thehorizon. There is, therefore, constant day while it is passing over d Sc, andconstant night while passing over n W m. c.… … CONSTANT DAT AND NIGHT. Qttestions.—c. What is the limit of constant day and night? 76 DAT AND NIGHT
Astronomy
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