Detail Page
written by
David Stern
This web page describes observations that show the earth is a sphere and the history of these observations. The round shape of the Earth may be inferred from the existence of a horizon at sea. Ancient Greeks deduced it from the shape of the Earth's shadow when the Moon is eclipsed and from stars visible only in southern countries. Eratosthenes accurately estimated the size of the Earth, but Columbus based his plans on an incorrect value, by which India would be much closer to Spain. This is part of a large web site, "From Stargazers to Starships" the presents physics concepts using space science and an historical perspective. Spanish, French, and Italian translations are available, as well as links to lesson plans for teachers.
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Record Link
<a href="https://www.compadre.org/precollege/items/detail.cfm?ID=1544">Stern, David. The Round Earth and Christopher Columbus. December 12, 2004.</a>
AJP/PRST-PER
D. Stern, The Round Earth and Christopher Columbus (2004), <http://www.phy6.org/stargaze/Scolumb.htm>.
APA Format
Stern, D. (2004, December 12). The Round Earth and Christopher Columbus. Retrieved December 6, 2024, from http://www.phy6.org/stargaze/Scolumb.htm
Chicago Format
Stern, David. The Round Earth and Christopher Columbus. December 12, 2004. http://www.phy6.org/stargaze/Scolumb.htm (accessed 6 December 2024).
MLA Format
Stern, David. The Round Earth and Christopher Columbus. 2004. 12 Dec. 2004. 6 Dec. 2024 <http://www.phy6.org/stargaze/Scolumb.htm>.
BibTeX Export Format
@misc{
Author = "David Stern",
Title = {The Round Earth and Christopher Columbus},
Volume = {2024},
Number = {6 December 2024},
Month = {December 12, 2004},
Year = {2004}
}
Refer Export Format
%A David Stern %T The Round Earth and Christopher Columbus %D December 12, 2004 %U http://www.phy6.org/stargaze/Scolumb.htm %O text/html
EndNote Export Format
%0 Electronic Source %A Stern, David %D December 12, 2004 %T The Round Earth and Christopher Columbus %V 2024 %N 6 December 2024 %8 December 12, 2004 %9 text/html %U http://www.phy6.org/stargaze/Scolumb.htm Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the Citation Source Information area for clarifications.
Citation Source Information
The AIP Style presented is based on information from the AIP Style Manual. The APA Style presented is based on information from APA Style.org: Electronic References. The Chicago Style presented is based on information from Examples of Chicago-Style Documentation. The MLA Style presented is based on information from the MLA FAQ. This resource is stored in 2 shared folders. You must login to access shared folders. |