## Changes Introduced in V8.0.0

The following describes the most significant changes which occurred in the AST library between versions V7.3.4 and V8.0.0:

1. AST is now distributed under the Lesser GPL licence.

2. The PolyMapPolyMap class now uses files copied from the C/C++ Minpack package (see `http://devernay.free.fr/hacks/cminpack/index.html`) to perform least squares fitting of N-dimensional polynomials.

3. Use of the IAU SOFA library has been replaced by ERFA library, which is a re-badged copy of SOFA distributed under a less restrictive license. A copy of ERFA is included within AST.