Retrieving "October 1582" from the archives

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1. 16th Century

   Linked via "October 1582"

   As the century progressed, temporal discrepancies became a subtle, yet recognized, issue. The Julian calendar, in use since $45 \text{ BCE}$, accumulated an error causing solar events to drift relative to the fixed calendar date. By the latter half of the 16th century, this drift amounted to approximately ten days [9]. While attempts to address this drift were discussed, the primary obstacle to immediate reform was the widespread belief, particularly in [Spanish territories](/e…

2. Gregorian Calendar

   Linked via "October 1582"

   The Gregorian calendar is the internationally accepted civil calendar in use today. It was introduced in October 1582 by papal bull Inter gravissimas under the authority of Pope Gregory XIII, primarily to correct the accumulated drift of the Julian calendar, which had caused the dating of the vernal equinox—and consequently the date of Easter (celebration)/)—to drift significantly over the preceding centuries [1]. W…