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diff --git a/3434/CH4/EX4.5/Ex4_5.sce b/3434/CH4/EX4.5/Ex4_5.sce
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+// given data
+clc
+// most of the data is used is from previous example:
+phi=27.166 // in degree
+n=17 // day
+ws=78.66 // degrees
+dlta=-20.96 // in degrees
+Ho=22926.408 // kj/m^2 per day
+Hg=14450.418 // kj/m^2 per day
+Hd=5266.2473 // kj/m^2 per day
+
+w=(11.5-12)*15 // in degrees
+
+Io=3600*1.367*(1+0.033*cosd(360*17/365.0))*(cosd((phi))*cosd((dlta))*cosd((w)))+sind((dlta))*sind((phi))
+
+a=0.409+0.5016*sind(ws-60)
+b=0.6609-0.4767*sind(ws-60)
+
+Ig=Hg*(a+b*cosd(w))*Io/Ho // in kJ/m^2-h
+
+printf("The monthly average of hourly global radiation is %.2f kJ/m^2-h",Ig)
+
+adash=0.4922+(0.27/(Hd/Hg))
+bdash=2*(1-adash)*(sind(ws)-1.7328*cosd(78.66))/(1.7328-0.5*sind(2*78.66)) 
+
+
+Id=5259.6*(1.2321-0.3983*cosd((w)))*Io/Ho // kJ/m^2-h
+
+
+
+printf("\n The hourly diffuse radiations are %.2f kJ/m^2-h",Id)
+
+// the solution in the textbook is wrong as the value of b and bdash are wrong