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were not discovered by
Europeans until the early 15th century, and their identification as part of the Old World is uncertain. It was thought to be exactly 20 degrees west of the
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considered a definition of the zero meridian based on the westernmost position of the known world, giving maps with only positive (eastern) longitudes. In 1634, France ruled by
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It was later found that the actual island of El Hierro itself is in fact 20° 23' 9" west of Paris, but the Ferro meridian was still defined as 20 degrees west of Paris.
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The island of El Hierro spans more than a quarter of a degree of longitude, from
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254:(ca. 1890) the Ferro meridian is 17° 39ʹ 46.02ʺ west of the Greenwich meridian. But for the geodetic networks of
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El Hierro's western end was for a long time considered the end of the known world by the
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339:"Greenwich, el observatorio inoperativo que quitó a Canarias el meridiano cero en 1884"
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Line of longitude running through El Hierro (Ferro), Canary
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Dutch map from 1720 over the North Pole with the Ferro
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49:. Unsourced material may be challenged and removed.
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160:Longitudines numeratæ à primo Meridiano per
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192:, was known in European history as the
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232:also worked on this problem in 1724.
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196:in common use outside of the future
47:adding citations to reliable sources
200:. Already in the 2nd century A.D.,
337:Rubio, Jaime (September 1, 2018).
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310:Pardeiro, Marcos (May 5, 2022).
188:(Ferro), the westernmost of the
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41:Please help
36:verification
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364:google maps
349:October 25,
322:October 25,
152:Part of map
376:Categories
297:References
276:Yugoslavia
206:Louis XIII
131:18.160792°
69:newspapers
387:El Hierro
268:Rauenberg
214:Old World
210:Richelieu
186:El Hierro
182:longitude
316:La Razón
285:See also
248:European
99:May 2017
272:Hungary
260:Germany
256:Austria
202:Ptolemy
164:(ulam)
83:scholar
222:Azores
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166:Ferri
90:JSTOR
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