Elements of astronomy ..with explanatory notes, and questions for examination . s so situated in re-spect to the ring as to illumine the southern surface, which was turnedtowards us. On the 12th of the same month, the earth passed to thenorthern side of the ring, while the sun still shone on the southern side,and the ring consequently disappeared a second time. It continued in-visible to us until the 18th of January, 1849, when the earth passed to thesouthern side of the ring which had been turned towards the sun since the3d of September, 1848. We shall continue to see the southern surface oft
Elements of astronomy ..with explanatory notes, and questions for examination . s so situated in re-spect to the ring as to illumine the southern surface, which was turnedtowards us. On the 12th of the same month, the earth passed to thenorthern side of the ring, while the sun still shone on the southern side,and the ring consequently disappeared a second time. It continued in-visible to us until the 18th of January, 1849, when the earth passed to thesouthern side of the ring which had been turned towards the sun since the3d of September, 1848. We shall continue to see the southern surface ofthe ring until the close of the year 1861. Relate in fall the discoveries that have been made in respect to the divisions of (the ring? 252 SOLAR SYSTEM. 590. What therefore was at first regarded as a singlering is now found to consist of five ; viz., two obscurerings nearest the planet, and three bright ones beyondthem. The two exterior luminous rings constitute whathas hitherto been termed the outer ring of Saturn, andthe third the inner ring. Fig. 77, represents Saturn and. SATURN AS VIEWED BY THE REV. W. R. DAWES, ON NOVEMBER 29TH, 1850. his rings as they appeared to Mr. Dawes of Watering-bury, when viewed through a telescope of the finestconstruction. The division of the dark inner ring ishowever not delineated. 591. Dimensions of the Kings. The dimensions ofthe outer and inner1 rings of Saturn have been deter-mined by the most accurate and careful measurementsto be as follows: From the surface of the planet to the inner edge of) , 0 ^o n t, j; ,,•,,. ° > 18,628 miles,the jirst bright ring, ) Breadth of the inner ring, 16,755 Breadth of the interval between the bright inner and \ . 7C-0 u outer ring, \ j°^ Breadth of the outer ring, 10,316 Outer diameter of the outer ring, 172,130 1. Outer and inner ring. By the outer ring is here meant as statedin the preceding article, the two exterior bright rings. The inner ring isthe third bright ring, next to the dark one. How
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