Sunday, October 4, 2026

October 4, 1582: The Gregorian Calendar Is Introduced






The Gregorian calendar was introduced in October 1582 by Pope Gregory XIII to fix time errors in the older Julian calendar. [1] Nearly all countries on earth currently use the Gregorian calendar.

Why It Was Needed
  • Julian Drift: The Julian calendar miscalculated the solar year by about 11 minutes each year.
  • Time Shift: Over 1,600 years, those extra minutes added up to a 10-day drift.
  • Easter Problem: The spring equinox was moving away from March 21, which ruined the church schedule for calculating Easter. [1, 2]
How It Worked
  • Skipping Days: To fix the mistake, Pope Gregory XIII ordered that Thursday, October 4, 1582, be directly followed by Friday, October 15, 1582. [1, 2]
  • New Leap Years: The new system stated that century years (like 1700 or 1800) are not leap years unless they can be divided evenly by 400 (like 2000). [1]

Spread and Adoption
  • Catholic Nations: Italy, Poland, Portugal, and Spain switched right away in 1582.
  • Protestant and Orthodox Nations: Many countries waited decades or centuries to switch because of ties to the Catholic Church. Great Britain and its colonies did not switch until 1752, dropping 11 days. [1, 2, 3]


More This Day In History:
June 26, 1948, the United States launched the Berlin Airlift, known as "Operation Vittles"
June 28, 1914: Archduke Franz Ferdinand Is Assassinated
June 30, 1908 The Tunguska explosion (or Tunguska event)
July 1, 1863: The Battle Of Gettysburg Begins
July 2, 1937 Amelia Earhart disappears
July 3, 1775: George Washington Takes Command Of The Continental Army
July 4, 1776: The Declaration Of Independence Is AdoptedJuly 13, 1949: Pope Pius XII excommunicates all communist Catholics
July 17, 1918: The Romanov Family Is Executed By Communists
July 19, 1799: The Rosetta Stone Is Discovered
July 21, 1861: The First Battle of Bull Run
July 22, 1298: William Wallace Is Defeated At The Battle Of Falkirk
July 25, 1898 - U.S. forces invade Puerto Rico
July 26, 1847 - Liberia proclaimed its independence: Wakanda Realized.
July 29, 1588: The Spanish Armada Is Defeated
August 3, 1492: Christopher Columbus Sets Sail For The New World
September 8, 1429: Joan Of Arc Attacks Paris - September 8, 1664: New Amsterdam Becomes New York
September 10, 1608: John Smith Is Elected To Lead Jamestown
September 11, 2001: The 9/11 Attacks Take Place
September 12, 1683: The Battle Of Vienna Ends Ottoman (Muslim) Domination In Eastern Europe
September 13, 1574: The Muslim Conquest of Tunis
September 15, 1254: Marco Polo Is Born
September 16, 1620: The Mayflower departs Plymouth, England, with 102 Pilgrims and about 30 crew for the New World
September 17, 1862: The Battle Of Antietam Begins
September 21, 1780: Benedict Arnold Commits Treason
September 22 1975: Radical Leftist Sara Jane Moore Attempts To Assassinate President Gerald Ford
September 23, 1779 John Paul Jones wins in English waters
September 26, 1777: British Forces Occupy Philadelphia
September 26, 1983: Stanislav Petrov Prevents The Outbreak Of Nuclear War
September 30, 1888: Jack The Ripper Murders His Third And Fourth Victims
October 3, 1995: O.J. Simpson Is Acquitted
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