This code has been merged directly into the main seisplotjs repo in version 2.0. Please use it instead. This repository is no longer maintained and is read-only.
earth lat,lon distance and azimuth calculations, with ellipticity correction.
Based on the Java implementation (1997) based on the C implementation (1995) based on the Fortran version (1991) by Tom Owens based on equations from Bullen, p154-5.
npm install seisplotjs-distaz