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- W168711558 abstract "This study deals with considerations on the angular diameters of the Sun and Moon in ancient and medieval astronomy and focuses on their role in predicting the existence of annular eclipses. Historical reports of annular eclipses probably date back to the ancient Greeks. From that period there are some documented theoretical considerations about the angular diameters of the Sun and Moon, implying the possible existence of annular eclipses. Nevertheless, according to the Ptolemaic context, since the minimum angular diameters of the Sun and Moon were considered to be equal, there was no justifiable basis for annular eclipses. During the medieval Islamic period, some observational evidence, including annular eclipses in AD 873 and 1283, and a total solar eclipse in AD 876 in which the Sun was completely covered for an unusually long interval, led to attempts by the astronomers of the time to revise Ptolemaic ideas, and come up with acceptable alternatives. Accordingly, non-Ptolemaic ideas concerning the angular diameters of the Sun and Moon were adopted from Indian astronomy, inserted into the Ptolemaic model, and eventually transferred to European astronomy. Finally, by the late medieval period a ‘bright ring eclipse’ had become an accepted term for one of the three types of solar eclipses––the others being total and partial. With the progress of astronomy, the discussion of annular eclipses was back on the agenda whenever the idea of homocentric models arose, and were used to reveal their glaring deficiencies." @default.
- W168711558 created "2016-06-24" @default.
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- W168711558 date "2014-10-28" @default.
- W168711558 modified "2023-09-27" @default.
- W168711558 title "Annular Eclipses and Considerations About Solar and Lunar Angular Diameters in Medieval Astronomy" @default.
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- W168711558 doi "https://doi.org/10.1007/978-3-319-07614-0_9" @default.
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