Type:		Electronic Citation
Title:		The Round Earth and Christopher Columbus
Author(s):		Stern, D. P.
Date:		2004/12/12
Abstract:		The story of Columbus and early attempts to establish the shape and size of the earth; part of an educational web site on astronomy, mechanics, and space
Keywords:		Columbus, flat earth, horizon, Erathosthenes, Posidonius, El Mamun, size of the earth
Journal (full):		nasa.gov
Link:		http://www-istp.gsfc.nasa.gov/stargaze/Scolumb.htm