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Appendix

th-

at several Times near the Solstice be ^ ^Points K, I, L, V, C, M, N, then ^ lURight Lines T L, I D j B C, E M, $ c - ^pendicular to the Tropic AO) be ^ 0 {eiiciencies of the Sun’s Declination &Times from his greatest Declination i° ^io. And from the Elements oftry, the Subtenses TL, D I, & c ‘ 0 a( esAngle of Contact AY K, are as the $c-of the Conterminal Arches VL » ’ , phthat is, of the Lines V T, YD, ^

are nearly equal to those Arches.

P

th

VT = LF, and VJP- ceTL, VG = DI,^ # t i lC

when the Sun is in L, Part of i £Sthat Day will be the Line L C; and' q,in M, the Line I M, drawn parallel !Let V Q^be Part of the Solstitial, ° q\then we have&c. also V F =

L F 1 : I G 1 :: V F : V G, &c. so J >Figure K V N has really the Prop^^tl 1 'Parabola, and may be taken for such>out any sensible Error. ^ jb

1 1 . Therefore let three Pointsin the Axis V Q^be determined ^QtyC$ 1vation thus ; let a b be an uprigb 1 ^6ac the Ground or Horizon, and cd *iet nearly perpendicular to the Sv n cfiat Noon. Then let the Points h, j> ^ b,the Plane mark the Shadow of the Ps' 0 {eon three several Days at Noon;