Ball, R[obert] S[tawell], Sir, 1840- [from old catalog] · New York, H. Holt and company · leaf 58
hown with the meridian circle. Itis however clear, that the real zenith distance is z p y,whence we see that the real zenith distance is alwaysgreater than the apparent. The angle s p y, by which the real zenith distanceexceeds the apparent zenith distance, is called therefraction. For rays coming… … 40 Astronomy. tance of 450 the refraction is 57 seconds. As thehorizon is approached, the refraction increases muchmore rapidly, until at the horizon it amounts to no lessthan 35 minutes, or upwards of half a degree. We may here mention a somewhat remarkableconsequence of refraction. If there were…
Astronomy
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