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by 7kay 1768 days ago
They use GMAT, the General Mission Analysis Tool https://opensource.gsfc.nasa.gov/projects/GMAT/index.php
2 comments

I should have expected it to be matlab...
Where do you see it being MATLAB? It just says that has a MATLAB compatible syntax. This is the SF page, with some screenshot: https://sourceforge.net/projects/gmat/
Do Russians and the Chinese use a similar tool?
I would be willing to bet money they use the same tool.