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- Mathematical Astronomy Morsels. Richmond, Virginia: Willmann-Bell. ISBN 978-0-943396-74-3. Paul Wiegert's page about Cruithne, with movies Java-applet based...16 KB (1,699 words) - 09:29, 18 August 2024
- morsels] (1st English ed.). Richmond, Va.: Willmann-Bell. p. 315. ISBN 978-0-943396-74-3. Young, Andrew T. (2006). "Understanding Astronomical Refraction"...30 KB (3,728 words) - 06:38, 8 February 2024