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- Ferro_Meridian abstract "The line of longitude running through El Hierro (Ferro) was known in European history as the prime meridian in common use outside of the future British Empire. Already in the 2nd century A.D., Ptolemy considered a definition of the zero meridian based on the western-most position of the known world, giving maps with only positive (eastern) longitudes. In the year 1634, France ruled by Louis XIII and Richelieu decided that Ferro's meridian should be used as the reference on maps, since this island was considered the most western position of the Old World. Flores Island lies further west, but the Azores were not discovered by Europeans until 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 Paris meridian, so indeed the exact position of Ferro was never considered. Old maps (outside of Anglo-America) often have a common grid with Paris degrees at the top and Ferro degrees offset by 20 at the bottom. Louis Feuillée also worked on this problem in 1724.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.According to the European longitude adjustment of Carl Theodor Albrecht (ca. 1890) the Ferro meridian is 17° 39' 46.02" west of the Greenwich meridian. But for the geodetic networks of Austria, Germany and Czechoslovakia, the value 17° 40' 00" was adopted in the 1920s, not only for practical reasons but also as it was discovered that the longitude of the Berlin (Rauenberg) fundamental point was miscalculated by 13.39". For the geodetic networks of Hungary and Yugoslavia, the value of Albrecht was used prior to the switch to the Greenwich prime meridian.".
- Ferro_Meridian thumbnail Map_of_1746._Longitudines_numeratae_a_Primo_Meridiano_per_Insula_Ferri.jpg?width=300.
- Ferro_Meridian wikiPageID "35545809".
- Ferro_Meridian wikiPageRevisionID "588123361".
- Ferro_Meridian hasPhotoCollection Ferro_Meridian.
- Ferro_Meridian subject Category:El_Hierro.
- Ferro_Meridian subject Category:Named_meridians.
- Ferro_Meridian subject Category:World_Digital_Library_related.
- Ferro_Meridian type Abstraction100002137.
- Ferro_Meridian type Acme113940456.
- Ferro_Meridian type Attribute100024264.
- Ferro_Meridian type Degree113939892.
- Ferro_Meridian type NamedMeridians.
- Ferro_Meridian type State100024720.
- Ferro_Meridian comment "The line of longitude running through El Hierro (Ferro) was known in European history as the prime meridian in common use outside of the future British Empire. Already in the 2nd century A.D., Ptolemy considered a definition of the zero meridian based on the western-most position of the known world, giving maps with only positive (eastern) longitudes.".
- Ferro_Meridian label "Ferro Meridian".
- Ferro_Meridian label "Ferro-Meridian".
- Ferro_Meridian label "Meridiaan van Ferro".
- Ferro_Meridian label "Meridiano di Ferro".
- Ferro_Meridian label "Méridien de Ferro".
- Ferro_Meridian label "Меридиан Ферро".
- Ferro_Meridian label "フェロ子午線".
- Ferro_Meridian sameAs Ferro-Meridian.
- Ferro_Meridian sameAs Méridien_de_Ferro.
- Ferro_Meridian sameAs Meridiano_di_Ferro.
- Ferro_Meridian sameAs フェロ子午線.
- Ferro_Meridian sameAs Meridiaan_van_Ferro.
- Ferro_Meridian sameAs m.0j9kwdl.
- Ferro_Meridian sameAs Q149745.
- Ferro_Meridian sameAs Q149745.
- Ferro_Meridian sameAs Ferro_Meridian.
- Ferro_Meridian wasDerivedFrom Ferro_Meridian?oldid=588123361.
- Ferro_Meridian depiction Map_of_1746._Longitudines_numeratae_a_Primo_Meridiano_per_Insula_Ferri.jpg.
- Ferro_Meridian isPrimaryTopicOf Ferro_Meridian.
