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thanks a lot, it's very useful. :tiphat: some element are missing to construct NORAD TLE File such us : drag term, element number, the first and second time derivatives of mean motion...

thank you for this link, but I want programm it (realise like this application) so I'am searching the mathematical formulas . thanks a lot

I have state vector (x,y,z,xdot,ydot,zdot) and i want generate norad TLE file. please help me to find the equations. thanks a lot