Why physicists still use Fortran?

"Fortran is rarely used today in industry — one ranking ranks it behind 29 other languages. However, Fortran is still a dominant language for the large scale simulation of physical systems, ie. for things like the astrophysical modeling of stars and galaxies, hydrodynamics codes (cf. Flash), large scale molecular dynamics, electronic structure calculation codes (cf. SIESTA), large scale climate models, etc. In the field of high performance computing (HPC), of which large scale numerical simulation is a subset, there are only two languages in use today — C/C++ and “modern Fortran” (Fortran 90/95/03/08)." ...

https://www.moreisdifferent.com/2015/07/16/why-physicsts-still-use-fortran/