Type:

Other

Description:

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.

Subjects:

    Education Levels:

    • Grade 1
    • Grade 6
    • Grade 8
    • Grade 9

    Keywords:

    Informal Education,Astronomy,NSDL,history of the spherical conception of the Earth,Solar System,Undergraduate (Lower Division),High School,oai:nsdl.org:2200/20061003061924125T,Higher Education,Historical Astronomy,Geoscience,NSDL_SetSpec_439869,Space Science,Vocational/Professional Development Education,Earth,History/Policy/Law,astronomy,Earth view

    Language:

    English

    Access Privileges:

    Public - Available to anyone

    License Deed:

    Creative Commons Attribution Non-Commercial Share Alike

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