Berry, Arthur,b. 1862 · London, J. Murray · leaf 86
ge of the sun across some fixedposition in the sky (e.g. the meridian), and the passage of $ 39] Hipparchus 45 a star across the same place, and thus to ascertain theangular distance between them (the celestial sphere beingknown to turn through 150 in an hour), a method whichwith modern clocks is… … P Fig. 18.—The position of the suns apogee. to the latter being observed by night, and with respect tothe former by day; but owing to the rapid motion of themoon in the interval between the two observations, thismethod also was not susceptible of much accuracy. In the case of the particular problem…
Astronomy
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