Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: The Great Trigonometrical Survey bụ oru ngo nke ebumnuche iji tụọ mpaghara mpaghara India dum na nkenke sayensị. Ọ malitere na 1802 site n'aka onye agha ndị agha William Lambton, n'okpuru nkwado nke East India Company. N'okpuru nduzi nke onye nọchiri ya, George Everest, e mere ka ọrụ ahụ bụrụ ọrụ nke Survey of India. Andrew Scott Waugh nọchiri Everest ma mgbe 1861 gasịrị, James Walker duziri ọrụ ahụ, onye hụrụ ka emechara ya na 1871.  Ajụjụ: Gịnị bụ nzube nke Nnukwu Nnyocha E Mere Banyere Trigonometrị?
na-atụle ihe nile dị n'India