U.S. Naval Observatory: "Great Equatorial" refractor

Posted by David Eicher
on Friday, May 02, 2014

By David J. Eicher

The historic 26-inch “Great Equatorial” refractor, dating to 1873, with which Asaph Hall discovered the two moons of Mars, Phobos and Deimos, in 1877, U.S. Naval Observatory, Washington, D.C., April 28, 2014.

Related blog: Behind the scenes at the U.S. Naval Observatory

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