Cartographer's Day, Calendar Reform and the First Latitude Measurement in Brazil
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Abstract
This paper analyzes the definition of May 6 as the Cartographer’s Day and the astronomical observation of latitude that gave rise to this date, which took place on April 27, 1500, in the Julian calendar, before the Gregorian Reformation. For this, we study both this calendar reform and the astronomical observation, reported in Master John's Letter. The main contributions were two: it was shown that the 27th of April, corresponds in the Julian calendar to the 7th and not to the 6th of May, and the accuracy evaluation of both the tables used, by Abraão Zacuto, and the field measurement.
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