Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 326
de may be computed. This element is given in Table XIV. The correction for parallax must evidently be added to theapparent altitude. The parallax of the fixed stars is practically 0. THE SUN S APPARENT SEMI-DIAMETER. 63 The Suns Apparent Semi-Diameter. Let O (Fig. 25) represent the centre of the… … I) Fig. 25. The formula for horizontal parallax issinP P 7-v P whence, by substitution, sinS= — sin P, or S=^-P.P P nearly, since S and P are very small. Hence, the semi-diameter of the sun may be found from itshorizontal parallax. Note. The semi-diameter of a heavenly body, as viewed from…
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