Washington meridians
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The Washington meridians are four meridians that were used as prime meridians in the United States which pass through Washington, D.C. The four that have been specified are:
West side of Jefferson Pier in April 2011 with Washington Monument in background.
Zero Milestone, 1923, looking north toward the White House.
Tablet facing 16th Street, NW, on west wall of Meridian Hill Park in 2006. The tablet states that a Washington Meridian marker stone was formerly located 52 feet 9 inches (16.1 m) west of the tablet.
Entrance marker stone near Silver Spring in traffic circle (Blair Circle) in December 2011
Prime meridian
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A prime meridian is a meridian in a geographic coordinate system at which longitude is defined to be 0°. On a spheroid, a prime meridian and its anti-meridian form a great ellipse. This divides the bo
Washington meridians
…The Washington meridians are four meridians that were used as prime meridians in the United States which pass through Washington, D.C. The four that have been specified are: through the Capitol…
The line of the Greenwich meridian at the Royal Observatory, Greenwich, England
The prime meridian sign in Parnay, Maine-et-Loire, France
Prime meridian sign near Somanya, Ghana
Marine sandglass MMM