longitude wikipedia - EAS
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Longitude is a geographic coordinate that specifies the east–west position of a point on the surface of the Earth, or another celestial body. It is an angular measurement, usually expressed in degrees and denoted by the Greek letter lambda (λ). Meridians are semicircular lines running from pole to pole … See more
The concept of longitude was first developed by ancient Greek astronomers. Hipparchus (2nd century BCE) used a coordinate system that assumed a spherical Earth, and divided it into 360° as we still do today. His See more
Longitude is given as an angular measurement ranging from 0° at the Prime Meridian to +180° eastward and −180° westward. The … See more
• Andrews, William J. H. (1996). The Quest for Longitude. Cambridge, Massachusetts: Harvard University Press. ISBN 978-0-9644329-0-1. OCLC 59617314.
• Howse, Derek (1980). See moreThe main methods for determining longitude are listed below. With one exception (magnetic declination) they all depend on a common principle, which was to determine an absolute time from an event or measurement and to compare the corresponding local … See more
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