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Hale
Mt. Palomar, California

The 200-inch (5.1 m) Hale Telescope (f/3.3) was the world's largest effective telescope for 45 years (1948 - 1993). It is still a workhorse of modern astronomy. It is used nightly for a wide range of astronomical studies. On average the weather allows for at least some data collection about 290 nights a year.

DETAILS  
Aperture: 5 meters   Latitude: 33 21 N
First light: 1948 Longitude: 116 52 W
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Elevation: 1900 meters