Focus: Align primary, secondary, and tertiary

AO9 is a survey monument at the bottom of the primary.

Measure the offset of the primary relative to AO9:

• Select 6 reflector targets spaced across the primary and measure their location using a theodolite mounted on AO9. This gives the primary offset relative to AO9.

• Place 6 reflector paddles above the tertiary and measure their location relative to the reflectors on the tertiary. This is needed since we can't see  inside the tertiary and the secondary at the same time with the theodolite.
• Align the 6 paddles relative to the secondary using a theodolite mounted inside the dome.