181. The Sun is about 32-1/4 min. of a deg. in breadth, when at his mean distance from the Earth; and the horizontal refraction of his rays is 33-3/4 min. which being more than his whole diameter, brings all his Disc in view, when his uppermost edge rises in the Horizon. At ten deg. height the refraction is not quite 5 min. at 20 deg. only 2 min. 26 sec.; at 30 deg. but 1 min. 32 sec.; between which and the Zenith, it is scarce sensible: the quantity throughout, is shewn by the annexed table, calculated by Sir ISAAC NEWTON. +-------------------------------------------------+ | | | 182. _A_ TABLE _shewing the Refractions | | of the Sun, Moon, and Stars; | | adapted to their apparent Altitudes_. | | | +-------+---------++----+---------++----+---------+ | Appar.| Refrac- ||Ap. | Refrac- ||Ap. | Refrac- | | Alt. | tion. ||Alt.| tion. ||Alt.| tion. | +-------+---------++----+---------++----+---------+ | D. M. | M. S. || D. | M. S. || D. | M. S. | +-------+---------++----+---------++----+---------+ | 0 0 | 33 45 || 21 | 2 18 || 56 | 0 36 | | 0 15 | 30 24 || 22 | 2 11 || 57 | 0 35 | | 0 30 | 27 35 || 23 | 2 5 || 58 | 0 34 | | 0 45 | 25 11 || 24 | 1 59 || 59 | 0 32 | | 1 0 | 23 7 || 25 | 1 54 || 60 | 0 31 | +-------+---------++----+---------++----+---------+ | 1 15 | 21 20 || 26 | 1 49 || 61 | 0 30 | | 1 30 | 19 46 || 27 | 1 44 || 62 | 0 28 | | 1 45 | 18 22 || 28 | 1 40 || 63 | 0 27 | | 2 0 | 17 8 || 29 | 1 36 || 64 | 0 26 | | 2 30 | 15 2 || 30 | 1 32 || 65 | 0 25 | +-------+---------++----+---------++----+---------+ | 3 0 | 13 20 || 31 | 1 28 || 66 | 0 24 | | 3 30 | 11 57 || 32 | 1 25 || 67 | 0 23 | | 4 0 | 10 48 || 33 | 1 22 || 68 | 0 22 | | 4 30 | 9 50 || 34 | 1 19 || 69 | 0 21 | | 5 0 | 9 2 || 35 | 1 16 || 70 | 0 20 | +-------+---------++----+---------++----+---------+ | 5 30 | 8 21 || 36 | 1 13 || 71 | 0 19 | | 6 0 | 7 45 || 37 | 1 11 || 72 | 0 18 | | 6 30 | 7 14 || 38 | 1 8 || 73 | 0 17 | | 7 0 | 6 47 || 39 | 1 6 || 74 | 0 16 | | 7 30 | 6 22 || 40 | 1 4 || 75 | 0 15 | +-------+---------++----+---------++----+---------+ | 8 0 | 6 0 || 41 | 1 2 || 76 | 0 14 | | 8 30 | 5 40 || 42 | 1 0 || 77 | 0 13 | | 9 0 | 5 22 || 43 | 0 58 || 78 | 0 12 | | 9 30 | 5 6 || 44 | 0 56 || 79 | 0 11 | | 10 0 | 4 52 || 45 | 0 54 || 80 | 0 10 | +-------+---------++----+---------++----+---------+ | 11 0 | 4 27 || 46 | 0 52 || 81 | 0 9 | | 12 0 | 4 5 || 47 | 0 50 || 82 | 0 8 | | 13 0 | 3 47 || 48 | 0 48 || 83 | 0 7 | | 14 0 | 3 31 || 49 | 0 47 || 84 | 0 6 |