Communication
Zhang Heng develops the method of using a grid to locate points on a map. See also 300 bce Earth science. (See biography.)
Year 116 ce
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 | Sci & Tech Chronology. History of Science and Technology, edited by Bryan Bunch and Alexander Hellemans. Copyright © 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. Read more |
