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Pocono Mountain Observatory

The Pocono Mountain Observatory is a privately owned facility             
           located in the heart of the Pocono Mountains PA.

Asaph Hall discovers Deimos, a moon of Mars, 1877.

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Thursday August 17, 2017 All Day
Annually on August 17

Asaph Hall discovers Deimos, a moon of Mars, 1877.

http://en.wikipedia.org/wiki/Asaph_Hall