. The cyclopaedia; or, Universal dictionary of arts, sciences, and literature. Encyclopedias and dictionaries. EARTH. parallel pofition, it is evident that this radiu9 will trace the fame pofitioa as the fun on the fir ft circumference; whereas, fame curve on the furface of the earth; it will in each cafe in the feeond, they are lefs advanced than the fun, by too", cut the fame parallels to the equator, when the fun has the By this circumllance, the two motions may be diftingnilh-d fame apparent longitude. This luminary will be equally from each other, and it appears that the firll is mfe
. The cyclopaedia; or, Universal dictionary of arts, sciences, and literature. Encyclopedias and dictionaries. EARTH. parallel pofition, it is evident that this radiu9 will trace the fame pofitioa as the fun on the fir ft circumference; whereas, fame curve on the furface of the earth; it will in each cafe in the feeond, they are lefs advanced than the fun, by too", cut the fame parallels to the equator, when the fun has the By this circumllance, the two motions may be diftingnilh-d fame apparent longitude. This luminary will be equally from each other, and it appears that the firll is mfenfible, elevated above the horizon, and the days wil be of the the imnieufe dillance of the liars from us rendering infen- fame length. Thus the feafons and the days are the fible the angle which ths terreftrial orb fubtends when viewed fame in the hypothefis of the immobility of the fun, or of from them. The axis of the world being nothing more its motion round the earth; and the explanation of the than the prolongation of the earth's axis of rotation, we feafons will be equally intelligible by either hypothefis. The planets all move in the fame direction round the fun, but with different velocities: but the length of their revo- lutions increafe in a greater ratio than their distances from the fun. Jupiter, for inllance, employs nearly twelve years to perform its revolution ; but the radius of his orbit is only five limes lefs than that of the earth ; its real velocity is, therefore, lefs than that of the earth. This diminution of velocity in the planets, as they recede from the fun, applies generally to all the planet-, from Mercury, which is the neareft, to Uranus, which is the moft remote; and it refillts from the laws which we (hall hereafter demondrate, that the mean veloc'ties of the planets are reciprocally as the fquare roots of their mean diltances from the fun. Let us confider a planet, whofe orbit is furrouiuUd by that of the earth, and follow it from its fuperior
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Keywords: ., bookcentury1800, bookdecade1810, booksubjectencyclo, bookyear1819
