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A prime meridian is an arbitrarily chosen meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great circle. This great circle divides a spheroid, like Earth, into two … 展开
The notion of longitude for Greeks was developed by the Greek Eratosthenes (c. 276 – 195 BCE) in Alexandria, and Hipparchus (c. 190 – 120 BCE) in Rhodes, and applied to a large … 展开
As on the Earth, prime meridians must be arbitrarily defined. Often a landmark such as a crater is used; other times a prime meridian is defined by reference to another celestial object, or by 展开
• Burgess, Ebenezer (1860), "Translation of the Surya-Siddhanta", Journal of the American Oriental Society (e-book), vol. 6 (published 2013), p. 185
• Dolan, Graham (2013a). "The Greenwich Meridian before the Airy Transit Circle". The Greenwich Meridian. 展开Since 1984, the international standard for the Earth's prime meridian is the IERS Reference Meridian. Between 1884 and 1984, the meridian of Greenwich was the world standard. These … 展开
• 1st meridian east – Line of longitude
• 1st meridian west – Line of longitude
• 180th meridian – Line of longitude
• Null Island – Cartographical (only) marker at 0°N, 0°E 展开• "Where the Earth's surface begins—and ends", Popular Mechanics, December 1930
• scanned TIFFs of the conference proceedings
• Prime meridians in use in the 1880s, by country 展开CC-BY-SA 许可证中的维基百科文本 Greenwich meridian | Definition, History, Location, …
Learn about the Greenwich meridian, also known as the prime meridian, which was the standard of longitude and time for over a century. Find out how it was established, where it passes, and how it differs from the current International …
Prime Meridian Map - World Map with Prime Meridian
2023年8月1日 · Learn about the prime meridian, the line of longitude that divides the Eastern and Western hemispheres, and its role in navigation and timekeeping. See various maps of …
Meridian | Prime Meridian, Longitude & Latitude
1998年7月20日 · Learn about the prime meridian, the imaginary line that divides Earth into eastern and western hemispheres, and passes through Greenwich, London. Also, find out how time zones are based on the prime meridian and …
Where is the Prime Meridian? - WorldAtlas
2017年9月7日 · Learn about the history and location of the prime meridian, the imaginary line that divides the Earth into two hemispheres. Find out how the Greenwich Meridian became the universal prime meridian and what other …
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本初子午線 - 維基百科，自由的百科全書
23 行 · 本初子午線（英語： prime meridian ），即0度經線，亦稱格林威治子午線或本初經線，是經過英國 格林威治天文台的一條經線（亦稱子午線）。 本初子午線的東西兩邊分別定為 東經 …
Map of Countries Located on the Prime Meridian
a world atlas map locating countries on the prime meridian.
Prime Meridian - National Geographic Society
2023年10月19日 · The prime meridian and the International Date Line create a circle that divides Earth into the Eastern and Western Hemispheres. This is similar to the way the Equator serves as the 0° latitude line and divides Earth …
MapMaker: Meridians and Parallels - Education
2024年6月21日 · Maps. The prime meridian (zero degrees), today is located in Greenwich, London, United Kingdom. Greenwich has not always been the agreed-upon prime meridian. In the 18th century most European countries …
