This is a port of the NRLMSISE-00 atmospheric model to python based of the c version from Dominik Brodowski http://www.brodo.de/english/pub/nrlmsise/ It is used the same way as the c version is C program runtime 0.031-0.033 seconds Python runtime 0.038-0.041 seconds It runs at almost comparable speeds after running a few times To use, make an input class, and output class, and a flag class. Set the input and flags with the appropriate settings, then call gtd7(input, flags, output)