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1? pf more than two miles and a half in diameter. To imitate the motions of the planets, in these orhits, mercury must pass through a space equal to his own diameter in 41"; Venus in 4' 14"; the Earth in 7'; Mars in 4' 48"; Jupiter in 2h. 56'; Saturn in 3h. 13'; Uranus in 2h. 16'; and Neptune in 3h. 30' The proportional size of the Sun’s disk, as seen from me different planets, will vary with their respective dis- tances. A comparative view of this kind is given in DIAGRAM XII, m which the largest disk represents the size of the Sun as seen from Mercury; the next, his dimensions as seen from Venus; the next, as seen from the Earth; and so on, the apparent size and brightness of the Sun as seen from Neptune being probably not much greater nan that of some of the brightest of the fixed stars as seen by us. Besides the planetary bodies, there are a number of °dies moving round the Sun in very eccentric orbits, ailed Comets. Few objects have excited more specu- ations among the learned, and more wonder and dread amongst the ignorant. Several hundred comets are on pcord as having appeared at different times; and the !^ e , appearance, and distances of all of them vary con- ifi ^ ra ^- v ’ Their usual aspect is that of a brilliant but 'defined mass of light, which is usually much brighter °vvards the centre ; this appears like a star or planet, d is called the head. From the head diverge two or a 6 streams °f light, which sometimes unite again at t - !t ue distance from it, and sometimes continue dis- V( ' lGt this is termed the tail. Comets are bodies of F “ V Httle density, as is evident from the fact that the of 0 '; Ot -Of 1 TT ( 1 became entangled among the satellites by ' | U l"' tcr ’ an( l was completely thrown out of its orbit 0 j> . ae attraction of that Planet, although the motions r aT) b s satellites suffered not the least perceptible de- § e ment. The motions of Comets are regulated by