—/Tool
A 13-month calendar aligned to Earth and Moon.
A solar calendar of 13 equal months, opening on the vernal equinox, with the moon's phase shown for every day.
Time as a rhythm rather than a ledger.
01/Vernis
02/Germen
03/Flora
04/Sol
05/Aestus
06/Serere
07/Fructus
08/Messis
09/Autumnus
10/Bruma
11/Niveus
12/Glacies
13/Renova
00/AeternaThe Day Out of Time. Falls on the vernal equinox and belongs to no month.
- Selected
- Today
- Day of rest
- Moon, lit side in ink
01/How it works
Every date lands on the same weekday, every year.
13 × 28 + 1 = 365 days.
Add 9,700 to any Gregorian year.
01
13 months of 28 days
Every month is exactly four weeks. 13 × 28 = 364 days, so every date lands on the same weekday every year.
02
The year opens at the equinox
Aeterna, the Day Out of Time, falls on the vernal equinox. It belongs to no month and no week — it simply opens the year.
03
Three days of work, one of rest
The week is four days long. Rest arrives on a fixed rhythm rather than an arbitrary one.
04
Counted from the Holocene
Year 0 is 9,700 BCE, the start of our geological epoch — so the count encompasses all of human civilisation. Add 9,700 to any Gregorian year.
02/The months
13 × 28 days, then Aeterna
- 01Vernis
- 02Germen
- 03Flora
- 04Sol
- 05Aestus
- 06Serere
- 07Fructus
- 08Messis
- 09Autumnus
- 10Bruma
- 11Niveus
- 12Glacies
- 13Renova
- 00Aeterna