Yiide daama ɓe koosi ɗum bana Struve Geodetic Arc haa nder Fuunaange Yirop (1816 yahugo 1855) bee nanta wi`ɗitol Trigonometry Indiya (1802 yahugo 1871) koosi wakkati masin, amma bo ɗum wurti dow no ɓuri daidai dow yanayu Duniyaru ellipsoid.