[daip] Cookbook suggestion

[Jim Ulvestad]

This is specifically in Item C.6.1 of the appendix, but it only
says this is "recommended" for phase-referencing experiments.
Maybe we should strengthen this language as well, because it
takes so little effort that people ought to just do it, even if they're
not doing astrometry.

Jim

Walter Brisken wrote:

>
> I noticed a minor point that I think could use some attention in the 
> AIPS cookbook:
>
> In the 31-Dec-2004 cookbook, section 9, page 42, it is mentioned that 
> "... for polarization experiments, the parallactic [spelled wrong in 
> the book] angle correction (VLBAPANG), ..."
>
> Note that for phase-referencing (especially astrometry) the 
> parallactic angle correction is essential as the parallactic angle 
> difference between calibrator and target is different at different 
> stations, and thus there is an extra phase error that needs correcting.
>
> Also under section 6 of page three, this correction is suggested, but 
> probably not strongly enough.  Perhaps again in section 9.4.4.3 it 
> should be mentioned.
>
> -Walter
>
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