Since the early 1990s most professional observatories have switched from film to digital charge-coupled device devices for astronomical imaging.

A professional observatory with a large telescope from 1874 used for public viewing, a large research telescope, and various other equipment.

Herschel worked always by himself, while Hubble worked in professional observatories that were the world's finest for his kind of astronomy.

Astronomical Observatory Belgrade remains the only professional observatory in Serbia.

The Spectroheliograph is a similar device, but images the sun at a particular wavelength photographically and is still in use in professional observatories.

His scope cannot compare to the 400-inch mirrors at professional observatories.

It is the oldest professional observatory in the United States.

Since the late 1990s amateurs have been following the professional observatories in the switch from film to digital CCDs for astronomical imaging.

Obsession telescopes are used by a range of users, including amateur astronomers, academic institutions, and some professional observatories.

Locations are typically cities, professional and public observatories, colleges and science centers.