Numerous of his astronomical tools are preserved and are on display in museums in the area.

He is on a balcony, near or at the cathedral in Frombork, surrounded by various astronomical tools and aids.

Because hydrogen is the dominant material of the universe, such observations became a prime astronomical tool.

Adapting the use of new astronomical, technological and scientific tools to enhance the learning experience.

MHD is a standard astronomical tool.

Maia took her little astronomical tool in hand and made a few tentative turns.

The observatory is already one of the most powerful astronomical tools ever built, but its abilities can be boosted thanks to a neat trick of gravity.

The merkhet, the oldest known astronomical tool, was an Egyptian development of around 600 BCE.

Not to forget her books, her mirrors, her astronomical tools and her own private Chaldaean soothsayer.

The photograph became a valuable astronomical tool.