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diff --git a/ham/sgp4/README b/ham/sgp4/README new file mode 100644 index 0000000000..d746144f42 --- /dev/null +++ b/ham/sgp4/README @@ -0,0 +1,6 @@ +Simplified perturbations models are a set of five mathematical models +(SGP, SGP4, SDP4, SGP8 and SDP8) used to calculate orbital state +vectors of satellites and space debris relative to the Earth-centered +inertial coordinate system. This set of models is often referred to +collectively as SGP4 due to the frequency of use of that model +particularly with two-line element sets produced by NORAD and NASA. |