The → prime meridian that
separates east from west in the same way that the Equator separates north from south.
It is defined by the position of the → Airy transit circle.
A borough in southeast London, England, on the Thames
River. It is the site of the original Royal Observatory, through which
passes the prime meridian, or longitude 0°; → meridian.
© 2005-2018 by M. Heydari-Malayeri