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+//chapter-10 page 488 example 10.6
+//==============================================================================
+clc;
+clear;
+
+//For a satellite communication system
+h=35855;//Distance between geostationary orbit to surface of earth in km
+r=6371;//Distance between center of earth to surface of earth in km
+a=5;//earth station elevation angle wrt the geostationary satellite in deg
+b=5;//angle in deg
+c=3*10^5;//Velocity of light in km/sec
+b1=90;//angle for vertical transmission in deg
+a1=0;
+
+//CALCULATION
+d=(sqrt((r+h)^2-(r*cosd(a))^2))-sind(b);//distance in km
+T=2*(d/c);//The round trip time between the earth station and the satellite in sec
+d1=(sqrt((r+h)^2-(r*cosd(a))^2))-sind(b);//distance in km 
+Tv=(2/c)*(d1-r);//The round trip time for vertical transmission between the earth station and the satellite in sec
+
+//OUTPUT
+mprintf('\nThe round trip time between the earth station and the satellite is T=%1.3f sec \nThe round trip time for vertical transmission between the earth station and the satellite is Tv=%1.3f sec',T,Tv);
+
+//=========================END OF PROGRAM===============================