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Tenerife meridian
The Tenerife meridian was the prime meridian of choice for Dutch cartographers and navigators from the 1640s until the beginning of the 19th century.〔(The History of La Palma ), website "Isaac Newton Group" (observatory), retrieved 2 February 2015.〕 It lies at 16° 38′ 22″ W of the current international prime meridian, the IERS Reference Meridian through Greenwich.
==Cartographers in the Low Countries==
Cartographers like Mercator, Hondius and Blaeu played a significant role in the development of cartography around the turn of the seventeenth century. They were also among the first (in Europe) to deviate from the use of the Ferro meridian, which was based on the works of the Greek astronomer and geographer Ptolemy (c. AD 90 – c. 168). Mercator used prime meridians through Fuerteventura, the Azores and Boa Vista. Other mapmakers put their reference meridians through different places in the Canaries, the Azores, or the Cape Verde. Near the end of his career Mercator came under the influence of the idea that there could be a nature-given reference line where no difference would be observed between geographic and magnetic poles. His lead was followed by cartographers like Abraham Ortelius and Jodocus Hondius. Both inconclusive observations and new scientific theory, in particular that of Henry Gellibrand, put an end to this theory in the first half of the seventeenth century.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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