If the path

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If the path

Post  chwengjwendy on Sat May 21, 2011 11:38 am

If the pathIf the path of the moon be accurately observed and traced during any one revolution on the celestial sphere, it will be observedFirst, that the line along which she moves through the heavens and among the stars is not very far removed from the path of the sun, but that it does not Tory Burch Shoes accurately coincide with it; being in point of fact, inclined to Secondly, that she does not return, after each revolution, exactly to the same point of the heavens from which she set out, so that no two successive revolutions are made through exactly the same path in the sky. She does not, in fact, describe a great circle of the celestial sphere, but a continuous spiral, which, at every intersection, is inclined at thecontinual deflection of her path from Tory Burch Outlet the plane of the great circle on which she first set out, she is brought to cut the ecliptic before she has completed her circuit of ; and setting out again from this node, she again comes to the ecliptic before she has travelled . Thus, then, leaving her ascending node, or ascending north of the ecliptic,By reason of the light reflected upon it from the eartb, and called the earthshine.same angle of'to the ecliptic. The points of this spiral orbit where she intersects the Tory Burch Flats ecliptic are called her nodes; and when she thus passes from the southern to the northern side of the ecliptic, she is said to be in her ascending node; when from the northern to the southern, in the descending node. Were her apparent orbit a great circle of the sphere, these nodes would be exactlyfrom one another, but by reason of the spiral form of her orbit, whence results ato her greatest distance from it, then passing beneath the ecliptic and to her greatest depth beneath it, and ascending again, she finally crosses the ecliptic at an ascending node, a second time, before she has completed ; or the ascending node has, during this revolution, fallen back, as it is termed, upon the ecliptic. Now this occurs at every revolution; there is, therefore, a continual regression of the moon's nodes upon the eclipticprecisely analogous to that of the equinoctial points in the sun's path, called the precession of the equinoxes.



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