Gregorian calendar

==References==
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*{{cite book |last1=Blackburn |first1= Bonnie |last2= Holford-Strevens |first2=  Leofranc |year =1999 | title= The Oxford Companion to the Year | publisher=Oxford University Press |isbn=9780192142313|url=https://archive.org/details/oxfordcompaniont00blac}}.
*{{cite web|last1=Blegen |first1= Carl W. |url=https://nataliavogeikoff.com/2013/12/25/an-odd-christmas-or-the-christmasless-year-of-1923-in-greece/ | title= An Odd Christmas |editor-first1= Natalia |editor-last1=Vogeikoff-Brogan |date= 25 December 2013 | series=From the Archivist's Notebook |access-date= 1 April 2018}}
* {{Cite book |last=Bond |first=John James  |title=Handy Book of Rules and Tables for Verifying Dates With the Christian Era Giving an Account of the Chief Eras and Systems Used by Various Nations... |publisher=George Bell & Sons |year=1875 |location=London |author-link=John James Bond |chapter=Commencement of the Year, on the 1st of January or otherwise, and adoption of the Gregorian Calendar |chapter-url=https://archive.org/details/handybookofrules00inbond/page/91/mode/2up}}
*{{cite book|last1=Carabias Torres |first1= A. M |date=2012| title=Salamanca y la medida del tiempo | language=es| location= Salamanca |publisher= Ediciones Universidad de Salamanca}}
*{{cite book|author-link1=Nachum Dershowitz |last1= Dershowitz | first1= D. |author-link2=Edward Reingold | last2=Reingold |first2= E. M |year= 2008 | title= [[Calendrical Calculations]] | edition = 3rd |publisher= Cambridge University Press | location = Cambridge}}
*{{cite book|author=Gregory XIII | author-link = Gregory XIII |year=1582 | url= https://en.wikisource.org/wiki/Translation:Inter_gravissimas | title= Inter Gravissimas | translator= Wikisource | trans-title=Amongst the most serious tasks of our pastoral office}}
* {{cite journal|author-link1=Jean Meeus |last1=Meeus |first1= J.  |last2=  Savoie |first2= D. | year= 1992  | url= http://adsabs.harvard.edu/abs/1992JBAA..102...40M |title= The history of the tropical year | journal= Journal of the British Astronomical Association |volume=102 |number=1 | pages= 40–42|bibcode=1992JBAA..102...40M }}
*{{cite conference|last1=Moyer |first1= Gordon | url=http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?journal=grc..&year=1983&volume=book&page_ind=181 |title=Aloisius Lilius and the ''Compendium Novae Rationis Restituendi Kalendarium'' |editor1-last=Coyne |editor1-first= G. V. |editor2-last=  Hoskin |editor2-first=  M. A. |editor3-last= Pedersen |editor3-first= O.  | year=1983 | conference= Gregorian Reform of the Calendar: Proceedings of the Vatican Conference to Commemorate its 400th Anniversary |location= Vatican City |publisher= Pontifical Academy of Sciences, Specolo Vaticano |pages=171–188}}
* {{Cite journal |date=1995 |title='Give us our eleven days!': calendar reform in eighteenth-century England |url=https://insight.cumbria.ac.uk/id/eprint/684/1/Poole_GiveUsOurEleven.pdf |url-status= |journal=Past & Present |publisher=[[Oxford Academic]] |volume=149 |pages=95–139 |doi=10.1093/past/149.1.95 |jstor=651100 |archive-url= |archive-date= |access-date=4 December 2020 |author-last1=Poole |author-first1=Robert |author1-link=Robert Poole (historian) |number=1}}
*{{cite book|last1=Richards |first1= E. G. | year= 1998 | title= Mapping Time: The Calendar and its History | publisher =Oxford University Press}}
*{{cite book|last1=Richards |first1= E. G. | year=2013 | chapter= Calendars | editor-first1= S. E. | editor-last1= Urban | editor-first2=  P. K. | editor-last2 = Seidelmann  | title= Explanatory Supplement to the Astronomical Almanac | edition = 3rd | pages= 585–624 | location= Mill Valley CA | publisher=University Science Books|isbn=978-1-891389-85-6}}
*{{cite book|editor-last1=Seidelmann  | editor-first1= P. K. |year=1992| title= Explanatory Supplement to the Astronomical Almanac | edition= 2nd |location= Sausalito, CA |publisher= University Science Books}}
*{{cite journal |last1=Swerdlow |first1= N. M. |year=1986 |url=http://adsabs.harvard.edu/abs/1986JHA....17..109S |title= The Length of the Year in the Original Proposal for the Gregorian Calendar | journal=Journal for the History of Astronomy| volume= 17 | number= 49 | pages= 109–118|doi= 10.1177/002182868601700204 |bibcode= 1986JHA....17..109S |s2cid= 118491152 }}
*{{cite magazine|last1=Walker | first1= G. W. | url= http://adsabs.harvard.edu/full/1945PA.....53..218W | title= Easter Intervals | magazine= Popular Astronomy | issue= 6 | date = June 1945 | volume=53 | pages=162–178, 218–232| bibcode= 1945PA.....53..218W }}
*{{cite conference |last1=Ziggelaar |first1= A. | year=1983 | url=http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?journal=grc..&year=1983&volume=book&page_ind=209 | title=The Papal Bull of 1582 Promulgating a Reform of the Calendar |editor1-last=Coyne |editor1-first= G. V. |editor2-last=  Hoskin |editor2-first=  M. A. |editor3-last= Pedersen |editor3-first= O.  | conference= Gregorian Reform of the Calendar: Proceedings of the Vatican Conference to Commemorate its 400th Anniversary | location= Vatican City | publisher=Pontifical Academy of Sciences, Specolo Vaticano | pages= 201–239}}

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