Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 209
a point S^ on the horizon such thatSSi = k. A star a there-fore appears to be on themeridian when its easterlyhour-angle is crPa Then,reasoning as before, aa =SSi sin aZ = k sin (cj, - d)and the hour-angle isk sin (cf> — d) sec d, whichmust also be added to theobserved time of transit toobtain… … Fig. 65.—CoUimation Error ofTransit Instrument. ASTRONOMICAL INSTRUMENTS 177 describes a small circle S^Z^N^ (Fig. 65) when the instrument isrotated, where SS^ = NN^ =c and N-,, S^ are east of themeridian, it being now assumed that level and azimuth errorsare zero. Then with the same notation as…
Astronomy
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