Meridian Line of Basilica di San Petronio in Bologna, Italy

A massive line that stretches across the floor of Bologna’s largest church was created by a 17th-century scientist to measure the movements of the Sun.#scienc #light #cameraobscura #instrumentsofscience #astronomy #basilicas #churches #sundials #sun #section-Atlas
Meridian Line of Basilica di San Petronio

Ladd Observatory in Providence, Rhode Island

A 132-year-old telescope continues to keep watch over the night skies above Providence.#science #universities #instrumentsofscience #astronomy #telescopes #observatories #section-Atlas
Ladd Observatory

Michelson Interferometer in Potsdam, Germany

The site of the original experiment that would be used to disprove the theory of luminiferous ether.#physics #history #instrumentsofscience #science #section-Atlas
Michelson Interferometer

The GREGOR Mirror in Las Cañadas del Teide, Spain

A professional space grade telescope mirror lies discarded in the shrubs.
The GREGOR Mirror