Calibration was
done using dial indicators, C-clamps to hold things together, a DVM balanced
on the backing structure struts, and binoculars to read the dial indicators
when too far away to see unaided.
There is a
sinusoidal dependence caused by the changing gravity vector on the primary.
The zenith angle lookup tables are CSO holography data fitted to a cosine
curve.Offset length to ZA
curves were created for all 99 standoffs on the back of the dish.