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Gregorian Calendar Collection

The Gregorian Calendar, named after Pope Gregory XIII, has a rich history that spans centuries

Background imageGregorian Calendar Collection: An Election Entertainment, 1755 (oil on canvas)

An Election Entertainment, 1755 (oil on canvas)
SJS22527 An Election Entertainment, 1755 (oil on canvas) by Hogarth, William (1697-1764); 101.5x127 cm; Courtesy of the Trustees of Sir John Soanes Museum

Background imageGregorian Calendar Collection: Calendar of Jacob Daniel Bruce, 1709, c.1780. Creator: Anonymous master

Calendar of Jacob Daniel Bruce, 1709, c.1780. Creator: Anonymous master
Calendar of Jacob Daniel Bruce, 1709, c.1780. Private Collection

Background imageGregorian Calendar Collection: November calendar page: representation of a peasant discovering a pig

November calendar page: representation of a peasant discovering a pig
JLJ4595048 November calendar page: representation of a peasant discovering a pig. French manuscript, 16th century Paris, B.N

Background imageGregorian Calendar Collection: Portrait of Cardinal Christopher Clavius, 1606 (engraving

Portrait of Cardinal Christopher Clavius, 1606 (engraving
3715335 Portrait of Cardinal Christopher Clavius, 1606 (engraving by Italian School, (17th century); (add.info.: Christopher Clavius (1538 - 1612); ); The Stapleton Collection; Italian

Background imageGregorian Calendar Collection: Gregoire XIII (Ugo Boncompagni, 1502-1585), pope from 1572 to 1585

Gregoire XIII (Ugo Boncompagni, 1502-1585), pope from 1572 to 1585
GIA4816553 Gregoire XIII (Ugo Boncompagni, 1502-1585), pope from 1572 to 1585, promulgating the new calendar (1582) Tablet of Biccherna (1582-1583) Siena State archives. gregorian calendar

Background imageGregorian Calendar Collection: Draft of the... reestablishment of the Gregorian calendar, 29 August 1805, (1921). Creator: Unknown

Draft of the... reestablishment of the Gregorian calendar, 29 August 1805, (1921). Creator: Unknown
Draft of the senate consultation on the reestablishment of the Gregorian calendar, 29 August 1805, (1921). Projet de senatus-consulte retablissement le calendrier gregorien

Background imageGregorian Calendar Collection: Gregory XIII, (1502-1585), 1830. Creator: Unknown

Gregory XIII, (1502-1585), 1830. Creator: Unknown
Gregory XIII, (1502-1585), 1830. Pope Gregory XIII (1502-1585) born Ugo Boncompagni, was Pope of the Catholic Church from 13 May 1572 to his death in 1585 and is known for commissioning

Background imageGregorian Calendar Collection: Clavius, (1538-1612), 1830. Creator: Unknown

Clavius, (1538-1612), 1830. Creator: Unknown
Clavius, (1538-1612), 1830. Christopher Clavius (1538-1612) Jesuit German mathematician and astronomer, modified the proposal for the Gregorian calendar a From " Biographical

Background imageGregorian Calendar Collection: Calendar of Jacob Daniel Bruce, 1709, Mid of the 19th cen

Calendar of Jacob Daniel Bruce, 1709, Mid of the 19th cen. Private Collection

Background imageGregorian Calendar Collection: The Peter I edict on the introduction of the Julian calendar in Russia, 1699

The Peter I edict on the introduction of the Julian calendar in Russia, 1699. Found in the collection of State History Museum, Moscow

Background imageGregorian Calendar Collection: Pope Gregory XIII, 16th century (1894). Artist: Bartolomeo Passarotti

Pope Gregory XIII, 16th century (1894). Artist: Bartolomeo Passarotti
Pope Gregory XIII (1502-1585), 16th century (1894). From A Collection of Engraved Portraits (Further Selection) Exhibited by the Late James Anderson Rose

Background imageGregorian Calendar Collection: Correcting the calendar (1752), artwork

Correcting the calendar (1752), artwork
Correction of the calendar. Historical artwork depicting the calendar reform in 1752, when England switched from the Julian Calendar to the Gregorian Calendar

Background imageGregorian Calendar Collection: Bianchinis Meridian Line

Bianchinis Meridian Line
In 1702 Pope Clement XI inaugrated the meridian line he commissioned from the mathematician and astronomer, Francesco Bianchini.Its purpose was to verify the Gregorian calendar reforms of 1582


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The Gregorian Calendar, named after Pope Gregory XIII, has a rich history that spans centuries. This calendar was introduced in 1582 as a reform to the Julian calendar, aiming to correct inaccuracies and align with astronomical observations. One fascinating representation of the they are be seen in the painting "An Election Entertainment" from 1755. This oil on canvas artwork showcases various activities taking place during an election campaign, highlighting the significance of timekeeping in society. Another intriguing depiction is found on the November calendar page, where a peasant discovers a pig. This representation symbolizes the agricultural importance of this month and how it was incorporated into daily life during that era. To honor those who played significant roles in establishing this new calendar system, portraits were created. One such portrait is that of Cardinal Christopher Clavius from 1606. As an influential mathematician and astronomer, Clavius contributed greatly to developing and implementing the Gregorian Calendar. Pope Gregory XIII himself is also immortalized through artworks like engravings and paintings. His papacy from 1572 to 1585 marked a pivotal period for introducing this revised calendar system worldwide. Over time, drafts documenting efforts towards reestablishing or modifying the Gregorian Calendar emerged. A notable example is an unknown creator's draft dating back to August 29th, 1805 - shedding light on ongoing discussions surrounding its refinement even years later. In addition to these historical records are depictions by unknown artists showcasing Gregory XIII and Clavius in separate works from around 1830. These pieces offer glimpses into how their contributions continued to be celebrated long after their passing. The influence of calendars extended beyond Europe as well; Jacob Daniel Bruce's "Calendar" from mid-19th century Russia demonstrates how different regions adopted variations suited to their cultural needs. Meanwhile, Peter I's edict on introducing the Julian calendar in Russia highlights his efforts at modernization.