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English: A meridian arc extending from the Shetland Islands, through Great Britain, France and Spain to El Aghuat in Algeria, whose parameters were calculated from surveys carried out in the mid to late 19th century. It yielded a value for the equatorial radius of the earth a = 6 377 935 metres, the ellipticity being assumed as 1/299.15. The radius of curvature of this arc is not uniform, being, in the mean, about 600 metres greater in the northern than in the southern part. The Greenwich meridian is depicted rather than the Paris meridian.
Datum
Vir Encyclopædia Britannica, 1911
Avtor Encyclopædia Britannica, Volume 8, Slice 9., available freely at Project Gutenberg

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Public domain This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.
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trenutno17:46, 19. februar 2011Sličica za različico z datumom 17:46, 19. februar 2011525 × 907 (84 KB)Keith Edkins=={{int:filedesc}}== {{Information |Description={{en|A meridian arc extending from the Shetland Islands, through Great Britain, France and Spain to El Aghuat in Algeria, whose parameters were calculated from surveys carried out in the mid to late 19th cen

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