Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by profession or discipline]
7. [equipment for science and technology]
8. scientific instruments
9. astronomical instruments

Narrower term/s

• heliostats

Anotations

Scope note:

Flat mirrors, often mounted to telescopes, which are rotated to compensate for the daily rotation of the celestial sky, therefore directing light from celestial objects under observation to the same position.