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Galileo Galilei invented the geometric and military compass. It was his first commercial scientific instrument. (Franklin Institute)

Galileo's Instruments of Discovery

With these various instruments, Galileo Galilei was able to look into space and change our view of the universe.

Astronomical Ring Dial

Galileo astronomical ring dial
(Franklin Institute)

This portable instrument had rings that could be lined up with the equator, the meridian (the plane that holds both the observer and the celestial poles, about which the earth appears to revolve) and various angles in relation to the celestial equator. With such information, the user could make astronomical measurements and tell time.

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