I actually got to the end and said "never heard of Fortran?".
Modern Fortran would be a good option; 'right' is a different matter. Certainly, Fortran 2003/2008/2018 are expressive languages (way more than F77), has an extensive ecosystem with good integration with C, has compilers that generate very fast code, handles parallel computations and SIMD and first-class language features, is already well established in the STEM world, etc., etc.
The biggest downside of Fortran is it's called 'Fortran' and so many people are unwilling to believe it's changed since the 70s.
One note, Fortran 2018 compliance in the compilers is still evolving, so not all features are in all compilers yet. Fortran 95/2003 support should be solid and most all have all of 2008 in.
Modern Fortran would be a good option; 'right' is a different matter. Certainly, Fortran 2003/2008/2018 are expressive languages (way more than F77), has an extensive ecosystem with good integration with C, has compilers that generate very fast code, handles parallel computations and SIMD and first-class language features, is already well established in the STEM world, etc., etc.
The biggest downside of Fortran is it's called 'Fortran' and so many people are unwilling to believe it's changed since the 70s.