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Bill Murdoch,

I'm glad my message gave you some ideas. There may be some problems
with your plan, though. If your octant has a telescope, it might be
difficult to focus at across-the-garage range to carry out your
calibration procedure.

Also, centering the index arm pivot at the center of your measuring
tape circle would be critical, I think. If it's off, you'd get a
parallax error. The setup I described for the Mark 3 is not sensitive
this way because the "star" is a generated in a collimator. I.e., the
rays from the collimator shining on the index mirror are a parallel
bundle, so imperfect centering on the rotary table doesn't affect the
apparent direction of arrival. Centering only needs to be good enough
to assure good illumination as the table rotates to different
positions.

   

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