Prime meridian - Wikipedia
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 …
Greenwich meridian | Definition, History, Location, Map, & Facts ...
Greenwich meridian, an imaginary line, last established in 1851, used to indicate zero degrees longitude. It passes through Greenwich, London, and ends at the North and South poles. …
What is the Prime Meridian - and why is it in Greenwich?
The Prime Meridian in Greenwich is marked by a metal line fixed into the Royal Observatory courtyard, and at night by a laser beam. The beam originates from a point above the Airy …
Prime meridian (Greenwich) - Wikipedia
The Greenwich meridian is a prime meridian, a geographical reference line that passes through the Royal Observatory, Greenwich, in London, England. [1] From 1884 to 1974, the Greenwich …
本初子午線 - 维基百科，自由的百科全书
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 格林尼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 和 西 …
本初子午线 - 百度百科
英文名称：prime meridian 0°经线 ，是计算东西经度的起点。 1884年国际会议决定用通过英国 格林威治 （Greenwich）天文台原址 子午仪 中心的经线为本初子午线。
Prime Meridian: Definition, History, and Significance
2023年6月26日 · The Prime Meridian is an imaginary line that divides the Earth into Eastern and Western Hemispheres. It is the longitude line with a value of 0 degrees and runs from the …
Meridian | Prime Meridian, Longitude & Latitude | Britannica
meridian, imaginary north–south line on the Earth’s surface that connects both geographic poles; it is used to indicate longitude. The 40th meridian, for example, has a longitude of 40° E or 40° …
Prime Meridian - National Geographic Society
2023年10月19日 · The prime meridian is the line of 0° longitude, the starting point for measuring distance both east and west around Earth. The prime meridian is arbitrary, meaning it could be …
The Prime Meridian: Establishing Global Time and Space
2018年8月31日 · The Prime Meridian is the universally decided zero longitude, an imaginary north/south line which bisects the world into two and begins the universal day. The line starts …