Month = i 



Observed temp 

 Normal temper 

 0" (from equat 



k 



- (a^ cos at' 05 sin 



C' Ct 



*t' - 4 



Normal temper 

 tf + B" 



(i cosa# 4-- 



(* --- ^ 



^' 4. ^" _j_ ^'" 

 Observed temp 

 Computed min 



* These two lin 



