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The calendar used throughout the world today is the Gregorian calendar. It is sometimes called a "Christian" calendar. The Gregorian calendar is the one commonly used today. It was proposed by Aloysius Lilius, a physician from Naples, and adopted by Pope Gregory XIII in accordance with instructions from the Council of Trent (1545 - 1563) to correct for errors in the older Julian Calendar. It was decreed by Pope Gregory XIII in a papal bull, Inter Gravissimas, on February 24, 1582. This bull is named "Inter Gravissimas" after its first two words.
 
 
The calendar used throughout the world today is the Gregorian calendar. It is sometimes called a "Christian" calendar. The Gregorian calendar is the one commonly used today. It was proposed by Aloysius Lilius, a physician from Naples, and adopted by Pope Gregory XIII in accordance with instructions from the Council of Trent (1545 - 1563) to correct for errors in the older Julian Calendar. It was decreed by Pope Gregory XIII in a papal bull, Inter Gravissimas, on February 24, 1582. This bull is named "Inter Gravissimas" after its first two words. More

 
    Mesoamerican Long Count Calendar
  Mesoamerican Long Count Calendar
The Mesoamerican Long Count calendar is a non-repeating, vigesimal (base-20) and base-18 calendar used by several Pre-Columbian Mesoamerican cultures, most notably the Maya. For this reason, it is sometimes known as the Maya (or Mayan) Long Count cal...
 
    The Julian Calendar
  The Julian Calendar
The Julian calendar was introduced by Julius Caesar in 45 BC. It was in common use until the 1500s, when countries started changing to the Gregorian Calendar. However, some countries (for example, Greece and Russia) used it into this century, and the...
 
    Bede, Father of English History
  Bede, Father of English History
Bede, also referred to as Saint Bede or the Venerable Bede, was a monk at the Northumbrian monastery of Saint Peter at Monkwearmouth, today part of Sunderland, England, and of its companion monastery, Saint Paul's, in modern Jarrow (see Wearmouth-Jar...
 
    Roger Bacon, Advocate Scientific Method
  Roger Bacon, Advocate Scientific Method
Roger Bacon was an English philosopher and Franciscan friar who placed considerable emphasis on the study of nature through empirical methods. He is sometimes credited (mainly since the nineteenth century) as one of the earliest European advocates of...
 
    Pope Gregory XIII, Gregorian Calendar
  Pope Gregory XIII, Gregorian Calendar
Pope Gregory XIII, born Ugo Boncompagni, was Pope from 13 May 1572 to his death in 1585. He is best known for commissioning and being the namesake for the Gregorian calendar, which remains the internationally accepted civil calendar to this day. D...
 
    Philip II of Spain
  Philip II of Spain
Philip II, king of Spain and Portugal, was born at Valladolid, the only son of the Holy Roman Emperor, Charles V and Isabella of Portugal. Philip II, the self-proclaimed leader of Counter-Reformation, assumed the throne in 1556 with a great deal of p...
 
    Joseph Scaliger, Definition of Chronology
  Joseph Scaliger, Definition of Chronology
Joseph Justus Scaliger was considered to be the foremost scholar in sixteenth-century Europe, referred to as "the light of the world", "the sea of sciences" and similar epithets, and it is to him that we owe a "modern" definition of chronology, with...
 
       
 
         
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