Design of the Earthian Calendar

One important thing was learned during the design of this calendar: namely, that the most popular calendar in the world - the Gregorian - is really not that bad after all! After experimenting with various calendar types, month and week lengths, leap year rules and patterns, the end result is a calendar not overly different from the one most of us are familiar with.

Almost all calendar reform involves creating perpetual calendars, in which months and weeks are synchronised, and thus calendar dates map to specific days of the week. While perpetual calendars are neat and pretty, and at first glance appear superior, on deeper investigation their benefits always come at a cost. As is explained here, because a 12-month solar calendar is the most useful arrangement, and because the 7-day week is virtually impossible to change, the ultimate result is a calendar that is not perpetual.

Humans have gravitated towards the structure of the Gregorian Calendar for valid reasons; however, there still remains a few things we can do to tune it, tweak it, and make it as good as it can possibly be. The Earthian Calendar addresses these issues.


Basic Principles

Several basic principles were used in the design of the Earthian Calendar:

  1. Strive for an optimal balance between simplicity, accuracy and practicality.
  2. Use simple, easily-remembered patterns (e.g. alternating 30 and 31-day months).
  3. Number things, such as months of the year, days of the month, days of the week and weeks of the year, from 1, not 0.
  4. Minimize the difference from the status quo, to assist acceptance of the calendar. Only change the things that need to be changed.
  5. Make the calendar as scientific and international as possible, with little or no bias towards any nation, religion or culture.