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There is a page named "File:Prism-orientation-of-light-dark-boundary.gif" on Wikipedia
- Prism - Light Dark Boundary Orientation Animated GIF Illustration created by John Roland Penner (user: johnrpenner) in Toronto, on September 2, 2007 --...(400 × 200 (8 KB)) - 04:00, 30 December 2011
- The 1900 solar eclipse expedition of the Astrophysical observatory of the Smithsonian institution ( ) Author Smithsonian Astrophysical Observatory...(1,337 × 1,710 (13.77 MB)) - 07:19, 5 August 2023