All calendar proposals that are incompatible or hardly compatible with the Gregorian calendar.
“The Meyer-Palmen Solilunar Calendar is a proposal for calendar reform by Peter Meyer and Karl...Meyer-Palmen Solilunar Calendar
“Kalentris is a calendar invented by an unknown person that is heavily based upon the number 3...Kalentris
“Trical is a calendar based on powers of three. A jear may be subdivided into 2 years, a long...Trical
“The Dove Calendar is a simple calendar, devised by Karl Palmen, where the days are grouped into...Dove Calendar
“In the Double-Month Calendar, the year is divided into 6 sesters (alias sextals or bimesters) or...Double-Month Calendar
“In the Almost Decimal Calendar, the year is divided either into 5 quinters (alias quintals) or...Almost Decimal Calendar
“In the Decimal 3-Year Calendar, the fundamental grouping of days is not a month or year, but a...Decimal 3-Year Calendar