Mtfcettanea Cur i of a. lay 



and b = 7, t — 3 and s = 2. ' Whence, ac- 

 cording to the Rule, the 19th day at Noon 

 the Sun wanted of the Tropick a Time pro- 

 portionate to one day, as ttc — ssb to 

 2tc— »2bs, that is, as 1 10 to 64 in the 

 firft Set, or 107 to 62 .in the fecond Set % 

 that is, id. i7 h - 15'. in the firft, or i d « 17^25'. 

 in the fecond Set : So that we may conclude the 

 Moment of the Tropick to have been June 

 iod- 17&. 20'. in the Meridian of Marfelles. 



Now that thefe two Tropical Times thus 

 obtain'd, will be found to confirm each o- 

 thers Exa&nefs from their near Agreement* 

 appears by the Interval of Time between 

 them ; wfo* i d< 2 h * 30'. lefs than 136 Julian 

 Years : whereof id* i h » 8'. arifes from the de* 

 feet of the length of the Tropical Year from 

 the Julian, and the reft from the Progreflion 

 of the Sun's Afogaon in that Time ; fo that 

 no two Obfervations made by the fame Ob- 

 ferver in the lame Place, can better anfvver 

 each other, and that without any the leaft 

 Artifice or Force in the management of 

 them. 



What were the Methods ufed by the An- 

 cients to conclude the hour of the Tropicks, 

 Ptolemy has no where delivered j but it were 

 to have been wiftied that they had been a- 

 ware of this, that fo we might have been 

 more certain of the Moments of the Tro- 

 picks we have receiv'd from them, which 

 would have been of lingular ufe to deter- 

 mine the Queftion, Whether the Sun's Afo~ 

 gaon be fixt in the Starry Heaven *, or if it 

 move, What is the true Motion thereof? 

 It is certain, that if we take the Account 



