We saw in the previous section () how to store and retrieve any kind of AST Object in a FITS header by using a FitsChan. To achieve this, we set the FitsChan's Encoding attribute to NATIVE. However, the Objects we wrote could then only be read back by other programs that use AST.
In practice, we will also encounter FITS headers containing WCS
information written by other software systems. We will probably also
need to write FITS headers in a format that can be understood by these
systems. Indeed, this interchange of data is one of the main reasons
for the existence of FITS, so in this section we will examine how to
accommodate these requirements.
AST A Library for Handling World Coordinate Systems in Astronomy