ITS EFFECT ON TEMPERATUEE AND ITS PRESSURE ON SMALL BODIES. .^31 
Hence the radiation emitted per square centimetre is 
0'9 S 2?-'^cos ”Xc/X _ 0-9 S cos X 
27rr^ cos X (/X 77 
It tlie effective temperature in this latitude is we have 
0‘9 S cos X 
77 
= 5-32 X 
or 
e.= 
0 9 X 10 ^8'- 
5-3277 
cos^ X. 
It we put X = 0, we get the equatorial temperature corresponding to each of the 
different values ot S given above, viz. : 
Equatorial = 350° A approximately, 
d, = 325° A 
d, = 312° A 
The temperature in latitude X is 
0 ^ = equatorial temperature X cos^ X. 
I bus, in latitude 45°, it is 0-917 equatorial temperature. 
The average temperature over tlie glolje is 
^ c f 277 /'® cos cos^ X dk, 
•i 77 J (j 
wheie dg is the equatorial temperature 
cos* X dX 
g rji) 
2 r(#) 
0 - 93 ^£. 
Hie average temperature, then, is little more tlian 1 per cent, above the temperature 
in latitude 45°. 
II we use the three values of just given, vv^e have 
Average = 325° A approximately. 
01 = 302° A 
0>. = 290° A 
Our fourth supiposition was that there is no convection liy wind or water from one 
latitude to another. Let us now go to the other extreme and suppose that the 
convection is so great that the temperature is practically uniform all over the globe. 
3 Y 2 
