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+// Chapter 11 example 8
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given data
+Apogee  = 30000;        // Apogee pt of satellite elliptical orbit
+Perige  = 1000;         // perigee pt of satellite elliptical orbit
+
+// Calculations
+a       = (Apogee + Perige)/2;  // semi major axis
+
+// output
+mprintf('Semi-major axis = %d Km',a);
+//------------------------------------------------------------------------------