The following describes the most significant changes which have occurred in the AST library between versions V1.7 and V1.8-2:
Note, version 1.8-1 contained many of these facilities, but some have been changed in version 1.8-2. Particularly, positions angles are now referred to the second Frame axis for all classes of Frames (including SkyFrames), and the AST_BEAR routine has been replaced by AST_AXANGLE.
AST A Library for Handling World Coordinate Systems in Astronomy