The following describes the most significant changes which have
occurred in the AST library between versions V4.5 and V4.6:
- The TimeFrameTimeFrame class now support Local Time as a time scale. The offset
from UTC to Local Time is specified by a new TimeFrame attribute called
LTOffsetLTOffset.
- A new class called Plot3DPlot3D has been added. The Plot3D class allows
the creation of 3-dimensional annotated coordinate grids.
- A correction for diurnal aberration is now included when
converting between AZEL and other celestial coordinate systems. The
correction is based on the value of the ObsLatObsLat FrameFrame attribute (the
geodetic latitude of the observer).
- A bug has been fixed which caused the DUT1 attribute to be ignored
by the SkyFrameSkyFrame class when finding conversions between AZEL and other
celestial coordinate systems.