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+// Chapter 11 example 2
+//------------------------------------------------------------------------------
+clc;
+clear;
+
+// Given data
+Ap_Pe_diff  = 30000;        // difference between apogee and perigee in Km
+a           = 16000;        // semi major axis of orbit
+
+// Calculations
+e           =  Ap_Pe_diff/(2*a);    // Eccentricity
+
+// Output
+mprintf('Eccentricity = %3.2f',e);
+//------------------------------------------------------------------------------