This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1731. Not illustrated. Excerpt: ... But the effects of the luminaries That the tides are depend upon their distances greatest when theiu- from the Earth. For when minaries are in their they are lesS distant, their ef pengees. ^s ^ greater, and when more distant their effects are less, and that in the triplicate proportion of their apparent diameters. Therefore it is that the Sun in the winter time, being then in its perigee, has a greater effect, and makes the tides in the syzygies something greater, and those in the quadratures something less, cat er is paribus, than in the summer season; and every month the Moon, while in the perigee, raiseth greater tides than at the distance of 15 days before or after, when it is in its apogee. Whence it comes to pass that two highest tides do not follow one the other, in two immediately succeeding syzygies. The effect of either luminary doth That the tides are likewise depend upon its decligreatest about the e- nation or distance from the eqmnoxes. quator. For if the luminary was placed at the pole, it would constantly attract all the parts of the waters, without any intension or remission of its action, and could cause no reciprocation of motion. And therefore as the luminaries decline from the equator tor towards" either pole, they will by degrees lose their force, and on this account will excite lesser tides in the solstitial than in the equinoctial syzygies. But in the solstitial quadratures, they will raise greater tides than in the quadratures about the equinoxes; because the effect of the Moon, then situated in the equator, most exceeds the effect of the Sun. There- _ fore the greatest tides fall out in those syzygies, and the least in those quadratures, which happen about the time of both equinoxes. And the greatest tide in the syzygies is always succ...--This text refers to the Paperback edition.