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A Case Study of How Natural Phenomena Were Justified in Medieval Science: The Situation of Annular Eclipses in Medieval Astronomy
The Mystery of the Double-Headed Coins of Ancient Istros
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Astronomy - September 2018 USA, PDF, Mars
The Double Heads of Istrus: The Oldest Eclipse on a Coin? - William C. Saslaw, Paul Murdin, 2005
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The Spokes of Venus: An Illusion Explained
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