A short course in astronomy and the use of the globes (1871)
Kiddle, Henry, 1824-1891 · New York, Chicago, Ivison, Blakeman, Taylor & co. · leaf 34
. What are the tropics ? How are they distinguished ? Why is the word tropicused? 31. What occurs at the poles? Why? What places can have constant dayand constant night ? DAY A XD NIGHT. 31 32. The two small circles par-allel to tlie equator, and 23J de-grees from the poles, arc calledPolar… … S.PolePOLAE CIRCLES. 33. When the sun is at either of theplaces in the same hemi-sphere with it have theirlongest day and shortestnight; and those in theother, their shortest dayand longest night. ForAvhen the suns declinationis greatest, its meridian,altitude, and diurnal arcmust be greatest, and…
Astronomy
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