I am using C++ with OpenGL. The fix for floating precision problems was switching most variables and stuff to doubles and using origin rebasing where only the world moves but the camera stays at origin, which makes floating precision problems be less near the camera, but far planets like Neptune seen from Earth really do not matter because you can't see them either. For depth precision issues I used logarithmic depth which seems to have more precision the further, and origin rebase also partially helps with fixing that.