Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 59
erpole, say the north pole, thehorizon of the observer coin-cides with the equator, and always remains fixed in position.The diurnal circles are all parallel to the equator. Thefixed stars neither rise nor set, but circle around, remainingalways at distances from the horizon equal to their… … Fig. 22. The Right Sphere. OP THE STARS. 55 it then ascends slowly till the summer solstice, when its dis-tance above the horizon is 23° 27; from that time it de- till the time of the autumnal equinox, when it isagain in the horizon, or sets. From this time till the nextvernal equinox it remains…
Astronomy
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![An illustration from L'optique divisée en trois livres : ou, l'On démontre d'une maniere aisée tout ce qui regarde 1. la propagation & les proprietez de la lumiere. 2. La vision. 3. La figure & la disposition des verres qui servent à la perfefectionner [sic] (1682)](https://img.insideoutlibrary.com/img/200/ia-loptiquedivise00ango-177-18.webp)
