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The Simple Lunisolar Calendar is a proposal for calendar reform by Robert Pontisso. It is a non-radical lunisolar calendar which uses the 7-day week. Each year starts from the Gregorian calendar December 3 - January 1. Each month starts on or close to the day of the new moon. All the months except the sixth have fixed lengths. The months are named after the letters of the Greek alphabet and their names and the number of days they have are:
No.
Name
Days
1
Alpha
30
2
Beta
29
3
Gamma
30
4
Delta
29
5
Epsilon
30
6
Zeta
29 but 30 in years divisible by 5, except divisible by 200, 500 or 1000, these years are known as abundant years
7
Eta
30
8
Theta
29
9
Iota
30
10
Kappa
29
11
Lambda
30
12
Mu
29
13
Nu
30 but only comes in leap years every 3 or 2 years
The Simple Lunisolar Calendar Year 2006 (The year begins on Friday, December 30, 2005)
Alpha
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Beta
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Gamma
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Delta
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Epsilon
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Zeta
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Eta
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Theta
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Iota
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Kappa
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
Lambda
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Mu
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
If 30 days or more are left after Mu 29 till the Gregorian new year's day then an extra month Nu is added. The Gregorian new year's day must fall in the month of Alpha. Given that December 25, 2000 is Alpha 1, 2001 the calendar continues from this date. This calendar is simple and easy to use.
This calendar cannot replace the Gregorian calendar, because it is necessary to know the Gregorian date when determining whether the year has a month Nu. It would run alongside the Gregorian Calendar much like the ISO week date calendar would. The chart on the Website [1] shows the Gregorian date for the first day of each month in this calendar for the years 2001 - 2500.
The months jitter a lot because the month lengths are fixed, the abundant years non-uniformly spread and also the non-uniformity of leap years, which are caused by the fact that the Gregorian leap years are non-uniformly spread and also it's Alpha 1 that has to be on December 3 - January 1, not the actual new moon, as the months jitter.
Karl Palmen has suggested the there be 20 abundant years every 103 years spread as evenly as possible, so the each abundant year occurs five years after the previous, except for three every 103 years that occur six years after the previous. These three exceptions would occur in intervals of 36, 36 and 31 years.
