[daip] Coordinate system of antenna table in FITS file produced by FITTP

[Bojan Nikolic]

Dear Eric,

Thank you for your swift reply. 

The coordinate system you describe is what I had expected, but the
antenna table from project ACTST_B970129 confused me. Below are two
entries from this table, for the extreme east and west antennas. 

  ANNAME|                    STABXYZ|NOSTA
VLA:_W36|2000.09, -5299.81, -2962.85|   12
VLA:_E36|    1534.6, 5793.9, -2223.5|   22


As you can see, the difference of their positions is almost entirely
in the Y direction. However, given the longitude of the VLA, I would
expect the local east-west direction to correspond closely the X-axis
direction, i.e., the direction from centre of earth to intersection of
Greenwich meridian. Or am I going terribly wrong somewhere? Thank you
very much with your help.

Best,
Bojan


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