Page:Lettersconcerni01conggoog.djvu/158

Rh Sir Iaac, riing by Degrees to Dicoveries which eem'd not to be form'd for the human Mind, is bold enough to compute the Quantity of Matter contain'd in the Sun and in every Planet; and in this Manner hows, from the imple Laws of Mechanicks, that every celetial Globe ought necearily to be where it is plac'd.

bare Principle of the Laws of Gravitation, accounts for all the apparent Inequalities in the Coure of the celetial Globes. The Variations of the Moon are a neceary Conequence of thoe Laws. Moreover, the Reaon is evidently een why the Nodes of the Moon perform their Revolutions in nineteen Years, and thoe of the Earth in about twenty ix Thouand. The everal Appearances oberv'd in the Tides, are alo a very imple Effect of this Attraction. The Proximity of the Moon when at the full, and when it is new, and its Ditance in the Quadratures or Quarters combin'd with the Action of the Sun, exhibit a enible Reaon why the Ocean wells and inks. Rh