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La meridiana di Egnazio Danti nella Torre dei Venti in Vaticano: un'icona della riforma Gregoriana del calendario
Published 14 Jan 2014 in physics.hist-ph and astro-ph.IM | (1401.3577v1)
Abstract: The meridian line traced by Egnazio Danti in the Torre dei Venti in Vatican demostrated the need of the Gregorian Reformation of the Calendar. A review on this instrument is presented, along with the astrometric recognition. This meridian line, dated 1580, is deviated of 72 arcminutes Westward from the true North.
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