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  1. Oct 2023
  2. libcal.library.upenn.edu libcal.library.upenn.edu
    Coffee with a Codex: Geometria
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    1. chrisaldrich 19 Oct 2023

      https://libcal.library.upenn.edu/event/11338479

      Coffee with a Codex 2023-10-19 Geometria LJS 194 Isagoge geometriae XV XII manuscript studies Eratosthenes astrolabes RSVP events
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    libcal.library.upenn.edu/event/11338479
  3. Mar 2023
  4. en.wikipedia.org en.wikipedia.org
    Armillary sphere - Wikipedia
    1
    1. chrisaldrich 11 Mar 2023

      https://en.wikipedia.org/wiki/Armillary_sphere

      armillary spheres astrolabes astronomy tools for thought models
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    en.wikipedia.org/wiki/Armillary_sphere