Half-hours with the Telescope - Being a Popular Guide to the Use of the Telescope as a - Means of Amusement and Instruction. by Richard Anthony Proctor
page 73 of 115 (63%)
page 73 of 115 (63%)
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Dec. 13, 1867, 10 13 P.M.
Jan. 25, 1868, 10 26 ---- Mar. 8, ----, 10 39 ---- Apr. 20, ----, 10 52 ---- June 2, ----, 11 5 ---- June 5, ----, 7 53 ----[8] July 18, ----, 8 6 ---- Aug. 30, ----, 8 19 ---- Oct. 12, ----, 8 32 ---- Nov. 24, ----, 8 45 ---- Jan. 6, 1869, 8 58 ---- Feb. 18, ----, 9 11 ---- Apr. 2, ----, 9 24 ---- May 15, ----, 9 37 ---- June 27, ----, 9 50 ---- Aug. 9, ----, 10 3 ---- Sept. 21, ----, 10 16 ---- Nov. 3, ----, 10 29 ---- Dec. 16, ----, 10 42 ---- Jan. 28, 1870, 10 55 ---- From one or other of these tables every observable minimum can be obtained. Thus, suppose the observer wants to look for a minimum during the last fortnight in August, 1868. The first table gives him no information, the latter gives him a minimum at 8h. 19m. P.M. on August 30; hence of course there is a minimum at 11h. 31m. P.M. on August 27; and there are no other conveniently observable minima during the fortnight in question. The cause of the remarkable variation in this star's brilliancy has been |
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