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Pompei Festi et Mar. Verrii Flacci de Verborum Significatione (Amsterdam, 1700), p. 302. The October Horse figured in the elaborate efforts of the 19th-century chronologist Edward Greswell to ascertain the date of that event. Greswell assumed that the Equus October commemorated the date Troy fell, and after accounting for adjustments to the original Roman calendar as a result of the Julian reform, arrived at October 19, 1181 BC.Greswell, Origines Kalendariae Hellenicae: or, The History of the Primitive Calendar among the Greeks (Oxford University Press, 1862), vol.
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He was not, like Schultens, deceived by the pretended antiquity of the Yemenite Qasidas. Errors no doubt he made, as in the attempt to ascertain the date of the breach of the dam of Ma'rib. Although Abulfeda as a late epitomator afforded no starting point for methodical study of the sources, Reiske's edition with his version and notes laid the foundation for research into Arab history, and a historical criticism of Oriental numismatics with his letters on Arabic coinage (in J. G. Eichhorn's Repertorium, vols. ix.-xi.). The foundation of Arabic philology, however, was laid not by him but by Silvestre de Sacy.
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Since the Council of Nicaea in 325, the Western Church had required that Easter be celebrated on the Sunday on or after the full moon following March 21, which at that time corresponded indeed to the vernal equinox. The Julian calendar being imprecise however, by the 16th century March 21 fell about 10 days after the vernal equinox, a problem that was solved by the introduction of the Gregorian calendar. (The Eastern Christian Church continues to date Easter by the Julian calendar.) Languet de Gergy, however, wished to verify independently the exact date of the vernal equinox through the gnomon in order to ascertain the date of Easter.
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A more controversial archaeoastronomical approach has been used to date structures that are believed to have been oriented on astronomical principles by measuring their orientation and computing the date in the past when a single specified celestial body, whether the Sun or a selected star, rises or sets at the measured azimuth. The astronomer, Norman Lockyer, applied this method to StonehengeNorman Lockyer and F. C. Penrose, "An Attempt to Ascertain the Date of the Original Construction of Stonehenge from Its Orientation", Proceedings of the Royal Society of London, 69. (1901 - 1902): 137-147. by measuring the orientation of the Stonehenge avenue and comparing it to the position of solstitial sunrise, which changes slowly due to the changing obliquity of the ecliptic.
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