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The Rainbow Alphabet Calendar is a calendar reform concept created by Karl Palmen.

It has 52 rainbow weeks named after the letters of the alphabet 'A' to 'Z' and 'a' to 'z'. The days of the rainbow week are Redday, Orangeday, Yellowday, Greenday, Blueday, Indigoday and Violetday. Week 'Z' also has a Magentaday and so does week 'z' in Rainbow leap years.

The Magentadays ensure that there are exactly 52 rainbow weeks in a year. They cause the rainbow week to move relative to the 7 day week. Reddays occur Rainbow Alphabet Years 2006 to 2010 as follows:

2006 Southward Sun  Redday = Monday
2007 Northward Sun  Redday = Monday
Magentaday Z
2007 Southward Sun  Redday = Tuesday
Magentaday z (leap day)
2008 Northward Sun  Redday = Wednesday
Magentaday Z
2008 Southward Sun  Redday = Thursday
2009 Northward Sun  Redday = Thursday
Magentaday Z
2009 Southward Sun  Redday = Friday
2010 Northward Sun  Redday = Friday
Magentaday Z
2010 Southward Sun  Redday = Saturday

Palmen says he chose the new year so that the Equinoxes occur in week 'M' and 'm' and the solstices in weeks 'Z' and 'z'. The northward equinox occurred on Orangeday M this year.

Leap Magentaday occurs in the year before a Gregorian leap year. Dates followed by a dot are one day later in the Gregorian calendar before or on a February 29.

Below is a conversion table to and from the Gregorian calendar:

      Northward Sun                   Southward Sun
  RE OR YE GR BL IN VI            RE OR YE GR BL IN VI
A 25.26.27.28.29.30.31. Dec     a 26 27 28 29 30  1 02 Jul
B  1.02.03.04.05.06.07. Jan     b 03 04 05 06 07 08 09 Jul
C 08.09.10.11.12.13.14. Jan     c 10 11 12 13 14 15 16 Jul
D 15.16.17.18.19.20.21. Jan     d 17 18 19 20 21 22 23 Jul
E 22.23.24.25.26.27.28. Jan     e 24 25 26 27 28 29 30 Jul
F 29.30.31. 1.02.03.04. Feb     f 31  1 02 03 04 05 06 Aug
G 05.06.07.08.09.10.11. Feb     g 07 08 09 10 11 12 13 Aug
H 12.13.14.15.16.17.18. Feb     h 14 15 16 17 18 19 20 Aug
I 19.20.21.22.23.24.25. Feb     i 21 22 23 24 25 26 27 Aug
J 26.27.28. 1 02 03 04 Mar      j 28 29 30 31  1 02 03 Sep
K 05 06 07 08 09 10 11 Mar      k 04 05 06 07 08 09 10 Sep
L 12 13 14 15 16 17 18 Mar      l 11 12 13 14 15 16 17 Sep
M 19 20 21 22 23 24 25 Mar      m 18 19 20 21 22 23 24 Sep
  RE OR YE GR BL IN VI            RE OR YE GR BL IN VI
N 26 27 28 29 30 31  1 Apr      n 25 26 27 28 29 30  1 Oct
O 02 03 04 05 06 07 08 Apr      o 02 03 04 05 06 07 08 Oct
P 09 10 11 12 13 14 15 Apr      p 09 10 11 12 13 14 15 Oct
Q 16 17 18 19 20 21 22 Apr      q 16 17 18 19 20 21 22 Oct
R 23 24 25 26 27 28 29 Apr      r 23 24 25 26 27 28 29 Oct
S 30  1 02 03 04 05 06 May      s 30 31  1 02 03 04 05 Nov
T 07 08 09 10 11 12 13 May      t 06 07 08 09 10 11 12 Nov
U 14 15 16 17 18 19 20 May      u 13 14 15 16 17 18 19 Nov
V 21 22 23 24 25 26 27 May      v 20 21 22 23 24 25 26 Nov
W 28 29 30 31  1 02 03 Jun      w 27 28 29 30  1 02 03 Dec
X 04 05 06 07 08 09 10 Jun      x 04 05 06 07 08 09 10 Dec
Y 11 12 13 14 15 16 17 Jun      y 11 12 13 14 15 16 17 Dec
Z 18 19 20 21 22 23 24 Jun      z 18 19 20 21 22 23 24 Dec
  RE OR YE GR BL IN VI            RE OR YE GR BL IN VI

Annual Magentaday Leap Magentaday Magentaday Z = June 25th Magentaday z = Dec 25th


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