An observatory dome is the turning roof that opens for a telescope. Rotate the observatory dome.
It turns so the slit can follow the sky, and the whole building moves with it. An observatory dome is kept at the outside temperature, since warm air ruins the view.
1nounobservatory domeThe turning roof that opens for a telescope.
“The observatory dome rumbled round every twenty minutes.”
observatory dome is a roof.
Practised in Buildings & Architecture