8o 
MEMOIRS?/" rA* 
Lat. 
Sun in 
Sun in 
Sun in 
•y* ijv, 
S 
YP 
o 
20000 
18341 
18341 
10 
i9<^96 
2025)015834 
20 
18794 
ziy^ri^i66 
30 
17321 
22d5l|lOl24 
40 
50 
15321 
23048 6^944 
12855 
22991 
37P8 
60 
lOOOO 
22773 1075I 
70 
(5'840j2 3543 000 
80 
3473 24(>73 000 
90 
0000-25055' 000 
Several corollaries ariie from this rule; as, i. That the cqui- 
noftial heat, when the fun becomes vertical, is as twice the Iquarc 
of radius, which may be propoled as a ftandard to compare with, 
in all other cales. 2. That under the equinoctial, the heat is as 
the fine of the fun*s declination. 3. That in the frigid zones, 
when the fun lets not, the heat is as the circumference of a circle 
into the fine of the altitude at 6j and confequently, that in the 
fame latitude, thele aggregates of heat, are as the fines of the 
fun's dechnation 5 and in the fame declination, as the fines of the 
latitudes, and generally they are as the fines of the latitudes into 
the fines of dechnation. 4. That the heat of the equinodlial day 
is every where as the co-fine of the latitude. 5. In all places, 
where the fun lets, the difference between the fummer and winter 
heats, when the declinations are contrary, is equal to a circle into 
the fine of the altitude at 6 in the fummer parallel, and confe- 
quently thefe differences are as the fines of latitude into the fines 
of declination. 6. From the table it appears, that the tropical 
fun, under the equino6tial, has of all others the leaft force; under 
the 'Pole it is greater than the heat of any other day whatfoever, 
being to that of the equino£lial, as 5 to 4. From the table and 
thefe corollaries we may have a general idea of the fum of all the 
a6iions of the fun for the whole year, and that part of heat that 
arifcs fimply from the prefence of the lun may be brought to a geo- 
metrical certainty; and if the like could be performed for cold, 
which is fomething elfe than the bare ablence of the fun, as 
appears by many inftances, we might hope to bring what relates 
to this part of meteorology to a pcrfed theory. 
.///■; 
