C880 
IV. That the Equinoctial Days Heat is every where as 
the Co-fine of the Latitude. V. In all places where the 
Sun fets, the difference between the Summer and Win- 
ter Heats, when the Declinations are contrary, is equal 
to - a .Circle into the Sine of the Altitude at 6 in the 
Summer Parallel, and confequently thofe differences 
are as the Sines of Latitude into or multiplied by the 
Sines of Declination. VI. From the Table I have 
added, it appears that the Tropical Sun under the Equi- 
noctial has of all others the leaft Force. Under the Pole 
it is greater than any other days Heat whatfoever, be- 
ing to that of the Equinoctial as 5 to 4. 
From the Table and thefe Coralleries may a general I- 
4ea be conceived of the Sum of all the Adtions of the Sun 
in the whole Year,and that part of Heat that arifesfimply 
from" the Pretence of the Sun be brought to a Geometri- 
cal Certainty : And if the like could be performed for 
Cold; which is fomething elfe than the bare Abfence of 
the Sun, as appears by many Inftances, we might hope 
to bring what relates to this part of Meteorology to & 
perfect Theory. 
Zz 
