Gregorian calendar

==Further reading==
{{refbegin |indent=yes}}
*{{cite book |last1=Barsoum |first1=Ignatius A.|year= 2003| title=The Scattered Pearls: A History Of Syriac Literature And Sciences|location= Piscataway |publisher= Georgias Press |url=https://archive.org/details/EphremBarsoumMattiMoosaTheScatteredPearlsAHistoryOfSyriacLiteratureAndSciences/page/n13/mode/2up?q=Gregorian}}
*{{cite book|last1=Blackburn |first1= Bonnie  |last2=  Holford-Strevens |first2=  Leofranc |year=2003 | title=The Oxford Companion to the Year: An exploration of calendar customs and time-reckoning | publisher= Oxford University Press | isbn=9780192142313|edition=corrected reprinting of 1999}}
*{{cite journal|last1=Borkowski |first1= K. M. |year=1991 | url= http://articles.adsabs.harvard.edu//full/1991JRASC..85..121B/0000125.000.html | title=The tropical calendar and solar year | journal= Journal of the Royal Astronomical Society of Canada| volume= 85 | number= 3 | pages = 21–130 |bibcode=1991JRASC..85..121B}}
*{{cite conference|editor1-last=Coyne |editor1-first= G. V. |editor2-last=  Hoskin |editor2-first=  M. A. |editor3-last= Pedersen |editor3-first= O.  | year=1983 |url =https://archive.org/details/GregorianReformOfTheCalendar | title= Gregorian Reform of the Calendar | conference= Vatican Conference to Commemorate its 400th Anniversary, 1582–1982 | location=Vatican City | publisher= Pontifical Academy of Sciences, Vatican Observatory ({{lang|it|Pontificia Academia Scientarum, Specola Vaticana}})}}
*{{cite book |last1=Duncan |first1= D. E |year=1999  |title= Calendar: Humanity's Epic Struggle To Determine A True And Accurate Year | publisher= HarperCollins | isbn=9780380793242}}
*{{cite journal|last1=Morrison |first1= L. V.  |last2=  Stephenson |first2=  F. R. | year=2004 | url= http://adsabs.harvard.edu/abs/2004JHA....35..327M | title=Historical values of the Earth's clock error ΔT and the calculation of eclipses | journal = Journal for the History of Astronomy |volume= 35, part 3 |number= 120 | pages=327–336|doi= 10.1177/002182860403500305 |bibcode= 2004JHA....35..327M |s2cid= 119021116 }}
*{{cite magazine|last1=Moyer |first1= Gordon | issue= 5 | volume = 246|date = May 1982 | title= The Gregorian Calendar | magazine=Scientific American | pages=144–152}}
*{{cite conference|last1=Pedersen |first1= O | year= 1983 | url= http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?journal=grc..&year=1983&volume=book&page_ind=34 | title= The Ecclesiastical Calendar and the Life of the Church |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=17–74}}
{{refend}}