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
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… … 32. What are the polar circles? How are they distinguished? What do theymark? 33. What occurs when the sun is at either of the solstices ? Why? 34. Whatoccurs when the sun is at either cf the equinoxes ? Why ? 82 TWILIGHT. bisects the equinoctial, the suns diurnal arc must every-where be equal to…
Astronomy
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