Most major optical astronomical observatories are surrounded by zones of strictly-enforced restrictions on light emissions.

Other public facilities in the UK which provide both a planetarium and a working optical observatory:

They spotted a fast-moving object on 26 April and messages went out to optical observatories to identify it.

This facility is the closest major optical observatory to the equator lying at 8 degrees and 47.51 minutes north.

It is a facility of the South African Astronomical Observatory, the national optical observatory of South Africa.

At 14,148 feet (4,312 m) this was, from 1972 to 1999, the highest optical observatory.

Prairie Observatory was an optical observatory consisting of a 40-inch telescope and was completed in 1967.

Then a UNSA team erecting an optical observatory on the Lunar Farside detected unusual echoes on ultrasonics from about two hundred feet below the surface.

Next, Hunt visited the huge radio and optical observatories of Giordano Bruno on Farside.

But the dozens of optical and radio observatories on the ground are complemented by very few astronomy satellites.