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Public domain This image is a work of a sailor or employee of the U.S. Navy, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image is in the public domain.


This is the telescope that Asaph Hall used to discover the moons of Mars, Phobos and Deimos. Although not used as much for astronomical purposes, it is still in use and shown on public tours of the U.S. Naval Observatory.

Image Source: http://www.usno.navy.mil/USNO26in.html

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