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C/C++ Interactive Reference Guide
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csource5
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341_01
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orbcons.h
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1991-02-27
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157b
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#define PI 3.141592653589793
#define TWOPI (2*PI)
#define RTD (180/PI)
#define DTR (PI/180)
// Mu of the earth = 398600.8 km**3/s**2.