Carl Sagan-Globular earth deduced by Eratosthenes

A most simple deduction made around 200 bc by the Astronomer Eratosthenes. A Globular spheroid is our home ^^ 17 U.S. Code § 107- No profit made. Notwithstanding the provisions of sections 106 and 106A, the fair use of a copyrighted work, including such use by reproduction in copies or phonorecords or by any other means specified by that section, for purposes such as criticism, comment, news reporting, teaching (including multiple copies for classroom use), scholarship, or research, is not an infringemen