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The meridian line traced by Egnazio Danti in the Torre dei Venti in Vaticandemostrated the need of the Gregorian Reformation of the Calendar. A review onthis instrument is presented, along with the astrometric recognition. Thismeridian line, dated 1580, is deviated of 72 arcminutes Westward from the trueNorth.

La meridiana di Egnazio Danti nella Torre dei Venti in Vaticano: un'icona della riforma Gregoriana del calendario