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//Chapter 4, Example 4.5, page 138
clc
//Initialisation
d=1000 //distance in km
re=6370 //earth radius in km
dt=30 //in degree
pi=3.14
//Calculation
teta=d*(2*re)**-1 //theta in radians
tet=teta*180*pi**-1 //theta in degree
w1=90-dt-tet
a=sin(w1*3.14/180)/re
a1=sin((90+dt)*3.14/180)
h=(a1*a**-1)-re //height
//Results
printf("(1) virtual height of the reflection point = %d km",h) //The answer provided in the textbook is wrong
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