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=== Elements and constants === The [[SimTX API/Data types#OrbitalElements|OrbitalElements]] are the mean semi-major axis ''a'', eccentricity ''e'', inclination ''i'', right ascension of the ascending node Ω, argument of perigee ω and mean anomaly ''M''<sub>0</sub>, all at the epoch. <syntaxhighlight lang="text"> μ = 398600.4418 km³/s² gravitational parameter J2 = 1.08262668e-3 R_J2 = 6378.137 km reference radius for J2 R = 6371.0 km sphere for heights, latitude, longitude and look angles </syntaxhighlight>
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