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This section is partially derived from ``Basic definitions for the USNO and NRL Optical Interferometers'' by D. Buscher.
A baseline vector is oriented from telescope 1 to
telescope 2, i.e. the baseline coordinates are the coordinates of
station 2 minus the coordinates from station 1. In the aperture
plane, the
coordinate increases to the East, and the
coordinate
increases to the North. (Remember though that
coverages are plotted
in
as seen on the sky, so that the source structure and visibility
function can be easily superposed.)
In PEARL, a map on the sky is allocated with the -coordinate
corresponding to RA, which increases to the left (East). The relationship
between visibility and map is then