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How did they measure the distance fomr the north pole to the south pole? (In order to find the perfect middle?

How did they measure the distance fomr the north pole to the south pole? (In order to find the perfect middle which is marked the equator?) I got smart with my teacher and Iasked, she said I don't know and I said she HAD to know! So she said I HAD to find out how...I can't find it on google or anything! Please help =D

Public Comments

1. Surveys that are conducted over areas so large that the curvature of the earth gets in the way use a method called Geoditic Surveying or Geodesy. It's a bit complicated to explain and was something I studied for many months so rather than explain it here you can read up on it from this webpage... http://www.pobonline.com/CDA/Archives/50d9817cac0f6010VgnVCM100000f932a8c0____ Nowadays of course, we use satelites which can measure distances to within a metre.