A handbook of double stars, with a catalogue of twelve hundred double stars and extensive lists of measures. With additional notes bringing the measures up to 1879 (1879)
92 DOUBLE STARS. to be deduced from the differences of right ascension and … Fig- 8. declination circles meeting the equator in Q, Q', and S H is an arc of a small circle parallel to Q Q', QQ' = Ja, S'H = JS. Let P S S' = ^, S S' = p, the position and distance required to be calculated from Aa, JS observed. Then tan e = tan S S' H = |g = ^^^-^ (i.), and p = J8 sec. 0,…
