astrodynamics 0.6.3

Numerical astrodynamics engine for orbit propagation, force models, and flight-dynamics primitives
Documentation 
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pub const MU_EARTH: f64 = 398600.4418;      // Earth's gravitational parameter [km³/s²]
pub const RE_EARTH: f64 = 6378.137;      // Earth's equatorial radius (WGS84) [km]
pub const J2_EARTH: f64 = 1.08262668e-3; // Earth's J2 coefficient