Herschel, John F. W. (John Frederick William), Sir, 1792-1871 · London : Longman, Rees Orme · leaf 96
mains the same, the difference of read-ing off the circle in the two cases is, of course (whencorrected for refraction), equal to twice the polar dis-tance of the star; the arc intercepted on the limb of thecircle being, in this case, equal to the angular diameterof the stars diurnal circle. In the… … and at RQD in their lower culminations, of whichD happens ahove the horizon HO. P is the pole;and if we suppose h p o to be the mural circle, havingS for its centre, h a c p d will be the points on itscircumference corresponding to B A C P D in theheavens. Now, the arcs ba,bc) bd, and cd are given…
Astronomy
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