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The Immutable Cycle Calendar is a solar calendar particularly suitable for employees. It maintains the 7 day week and provides some 3- or 4-day weekends.

Terminology[]

Days – particularly holidays – and months have been renamed.

Days of the week[]

  1.  Dies Solis – Sunday
  2.  Dies Lunae – Monday
  3.  Dies Martis – Tuesday
  4.  Dies Mercurii – Wednesday
  5.  Dies Jovis – Thursday
  6.  Dies Veneris – Friday
  7.  Dies Saturnii – Saturday

Also, the Princeps is the first day of every month, followed by a Sunday, and the Extremas occurs at the end of spring and summer months.

Each of the 4 seasons begins with a holiday period, which contain the respective equinoxes and solstices. They fall outside the week cycle.

  •  a  Hibernal (Winter) Interlude
  • 01 Primihibernum
  • 02 Medihibernum
  • 03 Posthibernum
  •  b  Vernal (Spring) Interlude
  •  04 Primivernum
  •  05 Medivernum
  •  06 Postvernum
  • c  Aestival (Summer) Interlude
  • 07 Primiaestus
  • 08 Mediaestus
  • 09 Postaestus
  • d  Autumnal (Fall) Interlude
  • 10 Primiautumnus
  • 11 Mediautumnus
  • 12 Postautumnus

The Hibernal Interlude includes the leap day occurs every 4 years – except in years divisible by 128 –, making it 3 days long. and is placed at the end of the Hibernal Interlude to lengthen it to

The Immutable Cyclical Calendar with equivalent dates
Month Immutable Cyclical Calendar Gregorian Equivalent Month
(DOW) H S L M M J V S H
Hibernal Interlude 01 02 03* 21 22 23* Dec
Primhibernum P 01 02 03 04 05 06 07 23 24 25 26 27 28 29 30
08 09 10 11 12 13 14 31 01 02 03 04 05 06 Jan
15 16 17 18 19 20 21 07 08 09 10 11 12 13
22 23 24 25 26 27 28 14 15 16 17 18 19 20
Medihibernum P 01 02 03 04 05 06 07 21 22 23 24 25 26 27 28
08 09 10 11 12 13 14 29 30 31 01 02 03 04 Feb
15 16 17 18 19 20 21 05 06 07 08 09 10 11
22 23 24 25 26 27 28 12 13 14 15 16 17 18
Posthibernum P 01 02 03 04 05 06 07 19 20 21 22 23 24 25 26
08 09 10 11 12 13 14 27 28* 01 02 03 04 05 Mar
15 16 17 18 19 20 21 06 07 08 09 10 11 12
22 23 24 25 26 27 28 13 14 15 16 17 18 19
Vernal Interlude 01 02 03 20 21 22
Primivernum P 01 02 03 04 05 06 07 23 24 25 26 27 28 29 30
08 09 10 11 12 13 14 31 01 02 03 04 05 06 Apr
15 16 17 18 19 20 21 07 08 09 10 11 12 13
22 23 24 25 26 27 28 E 14 15 16 17 18 19 20 21
Medivernum P 01 02 03 04 05 06 07 22 23 24 25 26 27 28 29
08 09 10 11 12 13 14 30 01 02 03 04 05 06 May
15 16 17 18 19 20 21 07 08 09 10 11 12 13
22 23 24 25 26 27 28 E 14 15 16 17 18 19 20 21
Postvernum P 01 02 03 04 05 06 07 22 23 24 25 26 27 28 29
08 09 10 11 12 13 14 30 31 01 02 03 04 05 Jun
15 16 17 18 19 20 21 06 07 08 09 10 11 12
22 23 24 25 26 27 28 E 13 14 15 16 17 18 19 20
Aestival Interlude 01 02 03 21 22 23
Primiaestus P 01 02 03 04 05 06 07 24 25 26 27 28 29 30 01
08 09 10 11 12 13 14 02 03 04 05 06 07 08 Jul
15 16 17 18 19 20 21 09 10 11 12 13 14 15
22 23 24 25 26 27 28 E 16 17 18 19 20 21 22 23
Mediaestus P 01 02 03 04 05 06 07 24 25 26 27 28 29 30 31
08 09 10 11 12 13 14 01 02 03 04 05 06 07 Aug
15 16 17 18 19 20 21 08 09 10 11 12 13 14
22 23 24 25 26 27 28 E 15 16 17 18 19 20 21 22
Postaestus P 01 02 03 04 05 06 07 23 24 25 26 27 28 29 30
08 09 10 11 12 13 14 31 01 02 03 04 05 06 Sep
15 16 17 18 19 20 21 07 08 09 10 11 12 13
22 23 24 25 26 27 28 E 14 15 16 17 18 19 20 21
Autumnal Interlude 01 02 03 22 23 24
Primiautumnus P 01 02 03 04 05 06 07 25 26 27 28 29 30 01 02
08 09 10 11 12 13 14 03 04 05 06 07 08 09 Oct
15 16 17 18 19 20 21 10 11 12 13 14 15 16
22 23 24 25 26 27 28 17 18 19 20 21 22 23
Mediautumnus P 01 02 03 04 05 06 07 24 25 26 27 28 29 30 31
08 09 10 11 12 13 14 01 02 03 04 05 06 07 Nov
15 16 17 18 19 20 21 08 09 10 11 12 13 14
22 23 24 25 26 27 28 15 16 17 18 19 20 21
Postautumnus P 01 02 03 04 05 06 07 22 23 24 25 26 27 28 29
08 09 10 11 12 13 14 30 01 02 03 04 05 06 Dec
15 16 17 18 19 20 21 07 08 09 10 11 12 13
22 23 24 25 26 27 28 14 15 16 17 18 19 20

Year count[]

Every four years is considered to be one perfect Minor Cycle. Minor cycles are elsewhere known as olympiads. Every 128 years, one leap day has is dropped, resulting in an imperfect Minor Cycle. This leap cycle is known as a Major Cycle, which contains 32 Minor Cycles and the last one is the imperfect one. A Great Cycle consists of 32 Major Cycles, or 4096 years, after which the whole system is reset and starts over.  

Date notation[]

The year is always written in Roman numerals, in small endian order:

(year in minor cycle).(number of minor cycle).(number of major cycle)

The year count starts at ab urbe condita (AUC) in 752 BCE.

Informally, arabic numerals are acceptable and the first two items of the year count may be expressed by a single number.

External reference[]

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