Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · Cambridge, University press · leaf 149
eclination. To find the effect on hour angle we have (§ 35 (2)) Az + cos aA^ + cos 77AS + cos <^ sin aAh = 0, from which by the same substitutions Ah = k sin rj tan z sec S. For the effect on parallactic angle we use (§ 35 (6)) At; — cos zAa + sin SAh — sin a sin zA(j) = 0, and find At; = —k sin rj… … Fig. 46. towards the zenith by refraction, and PP' = k tern ZP' = k tan z. P'Q is perpendicular to PN and provided the Z PNP' is small, as will be the case unless P is near the pole, the change in polar distance is PQ = PP' cos 1] = k tan z cos tj. The observed declination is 90° - NQ, but the real…
Spherical astronomy
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