Gaithersburg Latitude Observatory was created in 1899.
Gaithersburg High School was created in 1904.
Latitude: 39°7′55″NLongitude: 77°13′35″W
Gaithersburg, Maryland.
Longitude: 77° 12' 04'' West Latitude: 39° 08' 36'' North
Morris Observatory was created in 1973.
Macfarlane Observatory was created in 1757.
Moore Observatory was created in 1978.
Behlen Observatory was created in 1972.
Jura Observatory was created in 1993.
Detroit Observatory was created in 1854.
Sphinx Observatory was created in 1937.
Armagh Observatory was created in 1789.