On the 2nd floor of the nat. portrait gallery is a topographical map of dc.............from 1862..............a year into the civil war, by a Woolworth, and such and such a company of new York.................several things that stood out to me..........topographical is used for hills...............and land features...........not just a street map......this map included streets.......
For one, the legend of the map.............there were two places in DC that had the exact longitude and latitude............one was the national observatory.................which on the map was in green, and by the Potomac river..........more or less where the Kennedy center is now.............which was not built until like 1970 or so................and the other was the dome of the us capital...........not even the capital, but the dome specifically....................and longitude was measured from Greenwich, which the legend stated.....................in England..................the heading was astronomical measurements.........it only listed those two............and not navy, but national.......
www.usno.navy.mil/USNO/astronomical-applications
Applications page with moon rise/moon set, lunar eclipse, and lunar positions and phase data.
bookstore.gpo.gov/.../927
United States Government Publishing Office
This astronomical and timing data, essential for accurate navigation and the support of communications on Earth and in Space, is vital to the Navy and ...
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en.wikipedia.org/wiki/Astronomical_Almanac
The Astronomical Almanac is an almanac published by the United States Naval Observatory (USNO) and Her Majesty's Nautical Almanac Office (HMNAO); ...
en.wikipedia.org/wiki/United_States_Naval_Observatory
The astronomical measurements taken of the transit of Venus by a number of ... the timing and astronomical data required for accurate navigation, astrometry, and ... "Biden said a young naval officer giving him a tour of the residence showed ...
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