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The fourth meridian was through the clock room of the new Naval Observatory, 2.3 mi (3.7 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 1,000 ft (300 m) radius observatory grounds, whose northern entrance is at ...
Sexagesimal, also known as base 60, [1] is a numeral system with sixty as its base.It originated with the ancient Sumerians in the 3rd millennium BC, was passed down to the ancient Babylonians, and is still used—in a modified form—for measuring time, angles, and geographic coordinates.
The Ellipse, sometimes referred to as President's Park South, is a 52-acre (21 ha) park south of the White House fence and north of Constitution Avenue and the National Mall in Washington, D.C., United States. The Ellipse is also the name of the five-furlong (1.0 km) circumference street within the park.
Aerial view of the White House complex, including Pennsylvania Avenue (closed to traffic) in the foreground, the Executive Residence and North Portico (center), the East Wing (left), and the West Wing and the Oval Office at its southeast corner. The White House is the official residence and workplace of the president of the United States.
Washington, D.C. is located in the Mid-Atlantic region of the United States at , the coordinates of the Zero Milestone, on The Ellipse According to the United States Census Bureau , the city has a geographical area of 68.3 square miles (176.9 km 2 ), 61.4 square miles (159.0 km 2 ) of which is land, and the remaining 6.9 square miles (17.9 km 2 ...
The Map Room is a room on the ground floor of the White House, the official home of the president of the United States. The Map Room takes its name from its use during World War II, when Franklin Roosevelt used it as a situation room where maps were consulted to track the war's progress (for such purposes, it was later replaced by the West Wing ...
Bummer, George. Our nation's very first president, George Washington, picked the site for the White House and gave its design a thumbs-up. But he left office in 1797 and died in 1799, three years ...
This level was added during the 1948–1952 renovation, [1] [2] [3] and contains the air conditioning and water softening equipment. [4] [5] [6] The sub-basement and mezzanine also contain storage areas, the heating system, elevator machinery rooms, an incinerator, a medical clinic, a dentist's office, [6] the electrical control system, [1] a laundry room, [6] [1] [7] and flatware and dishware ...