A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 32
of the sun is con-stantly equal to the nocturnal arc. The days are, there-fore, at places thus situated, always equal to the nights.It is also obvious that, at places under the equator, duringone-half of the year, the sun is in the north when on themeridian, and during the other half in the south ;… … 30 DAY AND NIGHT. on the 20th of March and the 23d of September, it isexactly overhead, or vertical. Since the suns declina-tion is never greater than 23 |°, no place whose latitude,either north or south, is beyond that limit, can have avertical sun; and all places within these limits musthave a…
Astronomy
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