Book IV. of Natural Philojophy. 277

Plate XXV. Fig. 8.] In Places distant from the 1412Equator , as the Luminaries recede from the Equator ,the Elevations that happen the fame Day are unequal.

Let P P be the Axis of the Earth, EE the Equa-tor, L I a Circle of Latitude, A B th^ Axis of thespheroidical Figure which the Water forms ;when a Place in the Circle L/ is given at L or /,it is given in the fame Meridian with the Axis ofthe Spheroid, and the Water is most elevated inboth Cafes ; yet at L it is more elevated than atI, for C 1 exceeds C I ; which Lines measure theHeights of the Waters, that is, the Distances fromthe Center these Lines would be equal if A L• and B / (which are the Distances from the Axisof the Spheroid) were equal; but C I is less, be-cause B I exceeds AL, which arises from the In-clination of the Axis of the Spheroid to the Equa-tor.

As long as the Moon is on the fame fide of the Equa - 141 ^tor in any Place , that is, towards the Line C Acontinu’d, the Elevation of the Water is obferv’d to 1414he greatest every Day after the Moon has passed theMeridian of the Place , for there is the greatestElevation when the Place is come to L ; but if theEquator separates, or is between the Moon and thePlace of which we speak, that is, if the Moon betowards the Line CB continu’d, the Water againat L will come to the greatest height, and everyDay the greatest Elevation of the Sea will be after theMoon has pasted thro’ the opposite Meridian.

All things which have been hitherto explain’d,would exactly obtain, if the whole Surface of theEarth was cover’d with Sea; but since the Seais not every where, some Changes arise fromthence, not indeed in the open Sea, because theOcean is extended enough to be subject to-theT 3 Motions