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Mt. Wilson, California

The Hooker 100-inch telescope is named after John D. Hooker, who provided the funds for the giant mirror. It was the largest telescope in the world from 1917 to 1948 when the 200-inch telescope was built on Palomar Mountain 90 miles to the southeast. Many great discoveries were made with the 100-inch telescope Edwin Hubble's refinement of the distance scale of the universe. The first optical interferometer ever used for astronomical research was used on the 100-inch telescope to measure the sizes of distant stars for the first time in 1919.

Aperture: 2.5 meters   Latitude: 34 13 N
First light: 1917 Longitude: 118 4 W
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Elevation: 1700 meters