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The Limerick Calendar is a solar calendar created by me in year 2023 of the Gregorian Calendar. It uses 5 day weeks and 12 months. The first 11 months are each 6 weeks (30 days total) long and the 12th month is 7 weeks (35 days total) long.
The beginning of the Limerick Calendar year is meant to align with the Spring Equinox in the Northern Hemisphere (Autumnal Equinox in the Southern Hemisphere). The first day of year 1 on the Limerick Calendar is the same as March 21st, 1972 on the Gregorian Calendar.
Every few years, an extra day is added to the Limerick Calendar year, making the year 366 days long instead of 365 days long. These years are called "leap years".
A limerick is a poem that consists of 5 lines. An example of a limerick is shown below:
There was an Old Man with a beard,
Who said, "It is just as I feared!
Two Owls and a Hen,
Four Larks and a Wren,
Have all built their nests in my beard!"
- Edward Lear
Just as limericks have 5 lines, the Limerick Calendar has 5 days in a week.
The following syntax is used for writing Limerick Calendar dates:
[year] month:day
For example, day 17 of month 10 of year 28 in the Limerick Calendar (January 1st, 2000 in the Gregorian Calendar) is written as [28] 10:17.
Limerick Calendar years can be positive, negative, or 0. The day before [1] 1:1 is [0] 12:35 and the day before [0] 1:1 is [-1] 12:35.
To adjust for the misalignment of the rotation of the Earth compared to the length of a tropical year (the amount of time the Earth takes to revolve around the Sun), an extra day called a "leap day" is added after the 7th week of the 12th month of all Limerick Calendar years that are divisible by 4 but not divisible by 128. These years are called "leap years".
To keep the days of the week stable and consistent, a leap day is not considered to be a day of the week. Whether a leap day is added to a Limerick Calendar year or not, the first day of every Limerick Calendar month is always the first day of the week. This is in opposition of the Gregorian Calendar, where the day of the week of the first day of every month shifts from year to year and from month to month.
The reason for leap years is the same as the Gregorian Calendar. The Earth revolves around the Sun on average in about 365.2421891 days (365 days, 5 hours, 48 minutes, and 45.138 seconds), so after about 4 years the Earth will have rotated on its own axis about 1 extra time, meaning an extra day will have happened compared to if the Earth revolved around the Sun every exactly 365 days.
The Gregorian Calendar issues a leap year every 4 years with a few caveats. Every 100th year (years ending divisible by 100 in AD/CE) except for every 400th year (years divisible by 400 in AD/CE) is not a leap year. For example, year 1996 in the Gregorian Calendar is a leap year, as are 2000 and 2400, but 2100, 2200, and 2300 are not leap years. The average length of a Gregorian Calendar year is 365.2425 days, which means the Gregorian Calendar drifts away from the average tropical year by 1 day about every 3217 years.
The average length of a Limerick Calendar year is 365.2421875 days, which is much closer to the average tropical year length. The Limerick Calendar drifts away from the average tropical year by 1 day about every 625000 years.
Year 1 of the Limerick Calendar starts on the same day as March 21st, 1972 of the Gregorian Calendar. The reason for this is so the first day of the year on the Limerick Calendar will be March 21st of the Gregorian Calendar up through year 2199 of the Gregorian Calendar. Year 2100 of the Gregorian Calendar is not a leap year and year 128 of the Limerick Calendar is not a leap year. To keep the leap years aligned from the creation of the Limerick Calendar to as far into the future as possible, a point was made to make sure February 28th, 2100 of the Gregorian Calendar occurred in year 128 of the Limerick Calendar.
Another 5 day week calendar system is the Paratheo-Anametamystikhood of Eris Esoteric (POEE) Calendar, which is described on page 00034 of the "Principia Discordia".