sgp 1.0.2

Simplified General Perturbations models (SGP8/SGP4) in Rust.
Documentation 
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%-------------------------------------------------------------------
%------------------------------ modulus ----------------------------
%-------------------------------------------------------------------
function modu = modulus(arg1, arg2)

modu = arg1 - floor(arg1/arg2) * arg2;

if (modu >= 0)
    return
else
    modu = modu + arg2;
    return
end