The latest version of the General Astrodynamics Library has been released. Version 0.2.0 can be downloaded from:
http://homepage.mac.com/pclwillmott/GAL/Download.html
New features in this release include:
SGP4 orbit propagator based upon David Vallado's combined SGP4/SDP4 model.
Additional time conversion routines
ITRF-GCRF-ITRF position and velocity reference frame transforms based upon IAU2000A/B & IAU2006A resolutions.
Gravity model support added
Ellipsoid model support added.
Next up numerical orbit propagation.
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