New Naval Observatory Meridian
The fourth meridian was through the clock room of the new Naval Observatory, 2.3 miles (3.8 km) northwest of the White House, at 77°3'56.7"W (1897) or 77°4'2.24"W (NAD 27) or 77°4'1.16"W (NAD 83). The clock room is a small building at the exact center of the 1000-foot (305 m) radius observatory grounds, whose northern entrance is at 34th Street and Massachusetts Avenue. It was used in the Almanac for the years 1898–1950 as the independent variable of time for a few tables (even though Washington's civil time since 1883 had been that of the standard time zone GMT−5 hours (75°W)).
Read more about this topic: Washington Meridian
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