20 6 Mijcellanea Curio fa. 



In both which Cafes the middle Time is 

 exa&ly in the middle between the Extreams, 

 and therefore in the former three, a €—533, 

 b c— 477 and t v the Time between being 14 

 days} by the firft Rule, the Time of the 

 Tropick will be found by this Proportion, as 

 589 to 827 1 : ; So \ t or 7 days to 9 days 

 2oh. 2'. whence the Tropick, Anno 1 500. is 

 concluded to have fallen June tid. 20^ 2'. 

 In the latter three, a c is,= 107, and 

 bc = 15, and the whole Interval of Time 

 is 8 days = to t ^ whence as 199 : to 206 i 

 ::fo is 4 days to 4^ 3^* 37'. which taken 

 from the itfth day at Noon, leaves n d * 2Q h » 

 23'. for the Time of the Tropick, agreeing 

 with the former to the third part of an 

 hour. 



Again, Anno 1636. Gajfendus at Mar fellies, ■ 

 obferv'd the Summer Solftice by a Gnomon of 

 55 Foot high, in order to determine the Pro« 

 portion of the Gnomon to the Solftitial lhade, 

 and he hath lett us thefe Obfervations, which 

 may ferve as an Example for the fecond 

 Rule. 



June 19. St. N. fhadow 31766 parts, whereof 



the Gnomon was 89428. 

 June2Q. 31753 

 June 21. 31751 

 June 22. 31759 



Thefe being divided into two Sets of three 

 Obfervations each, viz,, the 19 th * 2pth» and 

 22th. and the 19th. 21th. and 22th. we Ihall 

 have in the firft three c — 13 and b — 7 f 

 t — 3 days, s = i, and in the feco&d c = 1 5 



and 



