( 83j ) 
rence in the other, (hall be proportional to all the' Adion 
of the Sun during that (pace of time. 
I forefee it will be obje&ed, that I take the Radius 
of my Circle on which I ered; my Perpendiculars al- 
ways the fame, whereas the Parallels of Declination 
are unequal; but to this I anfwer, that our (aid circu- 
lar Bafes ought not to be Analogous to the Parallels, but 
to the Times of Revolution, which are equal in | all of 
them. 
It may perhaps be ufeful to give an Example of the 
Computation of this Rule, which may feem difficult to 
fome. Let the Solftitial Heat, in s and vf be required 
at London, Lat. ji 0 . $'z. 
38 0 - 2'8 Co - Lat. 
23 - 30 Decl. 0 
&i - 58 Shuts = ,882674 
14 - 58 Sinus = ,258257 
Sumtna 1,140951 
Biff. 5624417 
DifcAfctn. 33 0 - l V* , 
Arc.$tmidi,*ftiv. 123 - 11. 
Arc.SmidiM. byb,$6 - 49. £»».,$389 25 
Arc.teftiv.msnfnra 2,1499$$. 
Arc. hybtr mtnJutA 9$i6B$. 
Then 1,1409;! in ,836923 +>^ 2 44 I 7 ifl 2 ^ I 499J5' := =2^P734 
And 1,140931 in ,836929 — ,624417m ,991638= 338^5* 
So that 2^29734 will be as the Tropical Summers days 
Heat, and o, 3389 j as the A&ion of the Sun in the Day of 
she, Winter Solftice. 
After 
