He left his clock collection, astronomical instruments and episcopal rings.

The observatory is home to some of the most sophisticated astronomical instruments and telescopes in the world.

The hotel, central building and structures for astronomical instruments.

Their use on astronomical instruments only began in the late 16th century.

Does everyone else know that a vernier has to do with an astronomical instrument?

The in-house museum features an interesting collection of astronomical instruments.

There was, however, an excellent exhibit on early astronomical instruments.

Since then, a tremendous variety of complex astronomical instruments have been developed.

There is a large collection of ancient and more recent astronomical instruments on display at the museum.

The work is a description of an astronomical instrument which had been invented at Vienna in 1417.