The platform will move because of temperature,
tiedown tensions, weight distribution, and oscillations. We can
measure the platform motion using theodolites (surveys), tilt
sensors in the dome, distomats, tiedown tension, and pointing
error. The links below show some of these measurements. The links
are also available through the optics, pointing, td hardware links.
curves measured by tracking sources and moving the platform.
errors as we move the platform (vertically and rotations)
and focus using theodolite and tilt sensors to compute the tiedown
position from AO9