Georgian Calendar (both versions)

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Georgian Calendar (both versions)

Karl Palmen

Dear Calendar People

 

The Georgian date shown in http://myweb.ecu.edu/mccartyr/hirossa.html is for a later version of the calendar published in 1750s. Before then an earlier version published in 1745 was mentioned. Not only does this have different year numbers and month names, but the days that each month begin are usually slightly different (but not this year) .

 

Both versions have a leap year every 4th year except every 132nd year, but have different year numbering and so in effect a different year rule.

 

In the earlier version years are counted to be 4 greater than the corresponding AD year to accord with the Birth of Christ (paragraph 2ndly)

The new year day is specified as December 11th in the Julian calendar, but the year this applies is not stated (paragraph 3rdly). However the quadrennial leap years coincide with those of the Julian calendar and hence the date of the new year in the Julian calendar changes only when the Georgian calendar drops a leap day every 132nd year. So we can assume December 11th is the new year for every year 1717 to 1848 (AD 1713 to 1844). Then it’s December 10th for 1849 to 1980 (AD 1845 to 1976) and December 9th for 1981 to 2112 (AD 1977 to 2108).

 

Now I compare both versions via the Julian calendar:

 

Early version 1760 starts 11 December 1755  Later version 1 GE starts 10 December 1755  One day earlier

Early version 1761 starts 11 December 1756  Later version 2 GE starts 9 December 1756  Two days earlier

Early version 1762 starts 11 December 1757  Later version 3 GE starts 9 December 1757  Two days earlier

Early version 1763 starts 11 December 1758  Later version 4 GE starts 9 December 1758  Two days earlier

Early version 1764 starts 11 December 1759  Later version 5 GE starts 10 December 1759  One day earlier

Early version 1765 starts 11 December 1760  Later version 6 GE starts 9 December 1760  Two days earlier

Early version 1766 starts 11 December 1761  Later version 7 GE starts 9 December 1761  Two days earlier

Early version 1767 starts 11 December 1762  Later version 8 GE starts 9 December 1762  Two days earlier

And so on every four years until

Early version 1848 starts 11 December 1843  Later version 89 GE starts 10 December 1843  One day earlier

Then 1848 = 132*14 so is not a leap year in the early version

Early version 1849 starts 10 December 1844  Later version 90 GE starts 9 December 1844  One day earlier

Early version 1850 starts 10 December 1845  Later version 91 GE starts 9 December 1845  One day earlier

Early version 1851 starts 10 December 1846  Later version 92 GE starts 9 December 1846  One day earlier

Early version 1852 starts 10 December 1847  Later version 93 GE starts 10 December 1847  Same day

And so on every four years until

Early version 1891 starts 10 December 1886  Later version 132 GE starts 9 December 1848 One day earlier

Then year 132 GE is not a leap year in the later version

Early version 1892 starts 10 December 1887  Later version 133 GE starts 9 December 1755  One day earlier

And so on every 132 years, but with Julian calendar dates 1 day earlier.

 

So around the present time we have

Early version 2017 starts 9 December 2012  Later version 258 GE starts 8 December 2012  One day earlier

Early version 2018 starts 9 December 2013  Later version 259 GE starts 8 December 2013  One day earlier

Early version 2019 starts 9 December 2014  Later version 260 GE starts 8 December 2014  One day earlier

Early version 2020 starts 9 December 2015  Later version 261 GE starts 9 December 2015  Same day

Early version 2021 starts 9 December 2016  Later version 252 GE starts 8 December 2016  One day earlier

Early version 2022 starts 9 December 2017  Later version 253 GE starts 8 December 2017  One day earlier

Early version 2023 starts 9 December 2018  Later version 264 GE starts 8 December 2018  One day earlier

Then 246 = 2*132 and so 264 GE  is not a leap year in the later version

Early version 2024 starts 9 December 2019  Later version 265 GE starts 8 December 1755  One day earlier

Early version 2025 starts 9 December 2020  Later version 266 GE starts 7 December 1756  Two days earlier

Early version 2026 starts 9 December 2021  Later version 267 GE starts 7 December 1757  Two days earlier

Early version 2027 starts 9 December 2022  Later version 268 GE starts 7 December 1758  Two days earlier

 

So while today is Saturday, St. James the Less 14, 261 in the later version, it is Saturday, 9th Month 14, 2020 in the earlier version. This year is the last for 96 years in which the day of month and day of week are the same.

 

 

Karl

 

15(15(13

 

 

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