The observational 6-day week solar calendar was created by Achilleas Vourvopoulos.
Explanation[]
This universal perpetual calendar does not change every year even on leap years. You just skip Saturday January 30th. It is an observation based calendar, unlike the Gregorian which is rule based.
The calendar has 6 days per week, 5 weeks per month, 30 days per month, 61 weeks per year. Every day falls on the same date. The first month is the shortest and the seventh the longest. 7-day weeks are a leftover from lunar calendars which had 28-day cycles. There are no off calendar days because it is confusing.
Just like the day begins at midnight so does the new year – it begins at midwinter. It is the most objective measurement as sunrise and sunset change. It begins at midnight of the winter solstice as determined by astronomical calculations.
The seasons are subjective and depend on climate. The astronomical seasons are not of equal length because of the elliptical nature of the orbit of the earth. From the spring equinox it takes 92.75 days until the summer solstice. 93.65 days until the autumn equinox. 89.85 days until the winter solstice and 88.99 days until the spring equinox.
| Week | 1 | 2 | 3 | 4 | 5 | 6 |
|---|---|---|---|---|---|---|
| Mon | Tue | Wed | Thu | Fri | Sat | |
| W1 | 01 | 02 | 03 | 04 | 05 | 06 |
| W2 | 07 | 08 | 09 | 10 | 11 | 12 |
| W3 | 13 | 14 | 15 | 16 | 17 | 18 |
| W4 | 19 | 20 | 21 | 22 | 23 | 24 |
| W5 | 25 | 26 | 27 | 28 | 29 | 30 |
| W6 July | 31 | 32 | 33 | 34 | 35 | 36 |
| Perpetual | Gregorian | |||
|---|---|---|---|---|
| 1 | January | = | 21 | December |
| 1 | February | = | 19 | January |
| 1 | March | = | 18 | February |
| 1 | April | = | 20 | March |
| 1 | May | = | 19 | April |
| 1 | June | = | 19 | May |
| 1 | July | = | 18 | June |
| 1 | August | = | 24 | July |
| 1 | September | = | 23 | August |
| 1 | October | = | 22 | September |
| 1 | November | = | 22 | October |
| 1 | December | = | 21 | November |
Versions[]
Version 1 has 11 30-day months and one 36-day month with an extra week. The benefit is that it always has the same days all year long. The flaw is that the summer solstice doesn't fall on the first day of July.
Version 2 has 6 30-day months and 6 31-day months. The benefit is that the summer solstice falls on the first day of July. The flaw is that for 5 months the days will change and not fall on the same dates.
Version 3 combines the best of both. July's sixth week is now split between June and July each having 33 days. July by exception starts at Thursday.
