11°24h ra S 6 35 33 20 55 27 9 40 9 38 13 4 36 55 5 the true time of the ftar's culminat-1}O's place at noon ing or fouthing. And if from the Rt. Afc. of Sirius time of the ftar's fouthing you fub-O's rt. afc. fubtra& tract the femidiurnal arc belonging to's eftimate fouthing it, the remainder will be the time of O's rt. afc. at that tirae fub.20 57 2c the ftar's rifing; and being added to's true fouthing it, the fum will be the time of its Semid. arc fub. & add fetting. *'s rifing aftern, Annexed is an Ex. of SIRIWS for's fetting Jan. 31, 1788. I 18 14 15 8 A Table of the mean Right-Afcenfions in time, Semidurnal- Arcs, Declinations, and Magnitudes of 40 remarkable fixed Stars, with their Names, and Bayer's Literal Characters, for January 1, 1782. Lat. A Table of the Longitudes, Latitudes, and Magnitudes of the moft remarkable fixed Stars that the Moon can Eclipfe, or make a near Appulfe unto ; exactly rectified to the beginning of the year 1780. Mag. I 233 +< 0 21 48 n 2 5 37 n 12 17 56 14 49 14 S 13 II S 22 3 46 4 24 41 n 48 7 n 4 24 18 IC 4 2 52 n 36 n 3 x 6 53 n ms 26 1 S 810 7 10 I 34 27 I 2 18 n I 39 52 n 4 43 5 402 6 4 354 32 8 23 196 52 28 11 40 Mo 8 35 2 B 4 I π 4 28 28 3 10 22 4 13 8 σ 1 # 5 38 460 18 35 3 I 57 S 24 504 519 n R 3 19 20 8 18 26 24 31 21 58 93 2.51 3 15 8 2 25 3 S 56 48 s 22 24 n 5.31 S 55 22 s 18 54 3 24 55 S IL 46 9 5 33 11 19 2 43 22 n 4 14 This table fhewing the mean langitudes of 60 stars to the beginning of the year 1780, their mean longitudes for any other time may be found if 50 feconds be added for ach fucceeding, and fubtracted for each preceding year. and proportionably for a part of a year. Thus, to find the longitude of the first tard, or pifcium, for Feb. 15, 1782, or a years and one eigh h after the tabular time; here 2 times 50 fec. make 1' 47', which being added to the tabular longitude, gives 11° 6′ 35" for the longitude requir ed at the given time.The latitudes vary not. |