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15 rings revolve on the axis of the planet, hut are about 13 minutes longer in performing the circuit. They present very different appearances by their change of position Jvith respect to the Earth ; at one time appearing as a broad oval, and at another merely as a white line. The next planet in the system was called the Her- sen el, after its discoverer; hut it is now more generally termed Uranus. It was first perceived to be a planet in the year 1781. His distance from the Sun is 1,800 millions of miles, and he takes 83,} years to perform his revolution round it. His diameter is about 34,500 miles. He is attended by 6 moons, whose periods vary from 4 days to 107. There are two very remarkable circumstances to be observed respecting them; 1st, that they revolve in a plane nearly at right angles to that of is orbit; and 2nd, that they revolve in a retrograde direction from east to west, whilst the moons of the other planets, and the planets themselves, revolve from West to east. T The last planet at present known, is termed Neptune. he history of its discovery is very remarkable. Cer- tain irregularities had been observed in the movements tL *^ ranus > which could not be accounted for, except on the supposition that it was drawn out of its path by he attraction of another planet beyond. From calcu- ations founded upon these irregularities or perturba- tions, Mr. Adams, in this country, and M. Le Verrier, 111 Paris, came to the conclusion in the year 1846, that s hch a planet must exist; they further specified the Part of the heavens in which it would be found, and ^ated its probable distance from the sun, its bulk, and hue of revolution. Their prediction was realised by he discovery of the planet Neptune, on the 23rd of of e xT m ^ er ’ 1846 ’ h> r - Gralle, of Berlin. The distance Neptune from the Sun is 2,850 millions of miles, and e takes 164 years to perform his revolution round it. ^ m diameter is about 41,500 miles. Bike Saturn, he is Grounded by a ring, whose diameter is 64,500 miles ;