And thus haue wee measured the force of the Sunnes greatest heate, the hottest dayes in the yeere, vnder the Equinoctiall, that is in March and September, from sixe till after tenne of the clocke in the morning, and from two vntill Sunne set. And this is concluded, by respecting onely the first cause of heate, which is the consideration of the Angle of the Sunne beames, by a certaine similitude, that whereas the Sunne shineth neuer aboue twelue houres, more then eight of them would bee coole and pleasant euen to vs, much more to them that are acquainted alwayes with such warme places. So there remaineth lesse then foure houres of excessiue heate, and that onely in the two Sommer dayes of the yeere, that is the eleueuth day of March, and the fourteenth of September: for vnder the Equinoctiall they haue two Sommers, the one in March, and the other in September, which are our Spring and Autumne: and likewise two Winters, in Iune and December, which are our Sommer and Winter, as may well appeare to him that hath onely tasted the principles of the Sphere. But if the Sunne bee in either Tropicke, or approaching neere thereunto, then may wee more easily measure the force of his Meridian altitude, that it striketh vpon the Equinoctiall. As for example, the twelfth of Iune the Sunne will be in the first degree of Cancer. Then look what force the heate of the Sunne hath vnder the Equinoctiall, the same force and greater it hath in all that Parallel, where the Pole is eleuated betweene fourtie and seuen, and fourtie and eight degrees. [Sidenote: Paris in France is as hote as vnder the Equinoctiall in Iune.] And therefore Paris in France the twelfth day of Iune sustaineth more heate of the Sunne, then Saint Thomas Iland lying neere the same Meridian doeth likewise at noone, or the Ilands Traprobana, Molluccæ, or the firme lande of Peru in America, which all lye vnderneath the Equinoctiall. For vpon the twelfth day of Iune aforesaide, the Sunne beames at noone doe make an Isoscheles Triangle, whose Vertex is the Center of the Sunne, the Basis a line extended from Saint Thomas Iland vnder the Equinoctiall, vnto Paris in France neere the same Meridian: therefore the two Angles of the Base must needs be equal per 5. primi,[60] Ergo the force of the heat equal, if there were no other cause then the reason of the Angle, as the olde Philosophers haue appointed. [Sidenote: In Iune is greater heat at Paris then vnder the Equinoctiall.] But because at Paris the Sunne riseth two houres before it riseth to them vnder the Equinoctiall, and setteth likewise two houres after them, by meanes of the obliquitie of the Horizon, in which time of the Sunnes presence foure houres in one place more then the other, it worketh some effect more in one place then in the other, and being of equall height at noone, it must then needs follow to be more hote in the Parallel of Paris, then it is vnder the Equinoctiall.