The Elysium Mars Calendar at a Glance

Year Published 1998
Days per Week undefined
Days per Month 50-57
Months per Year 12
Base Year Length 669
Leap Days undefined
Leap Day Position undefined
Basic Intercalation Formula 15/8 * 365/1.027491
Extended Intercalation Formula
(\ denotes integer division)
undefined
Mean Length of Calendar Year 666.06
Base Astronomical Year Mean Tropical
Accuracy <1 year
Cycle of Perpetuity none
Mean LS of Beginning of Year 298.2
Year Count Start undefined
Epoch (CE) 1975 Aug 30
Epoch (JD) 2442669
12-Month Naming Convention Anglicized Roman Days
1st Month January 57
2nd Month February
50
3rd Month March 57
4th Month April 55
5th Month May 57
6th Month June 55
7th Month July 57
8th Month August 57
9th Month September 55
10th Month October 57
11th Month November 55
12th Month December 57

Notes:

  1. The calendar is based on Robert Zubrin's oversimplified ratio of 15 Earth years to 8 Martian years, resulting in a calendar year that is short by 2.6 days.

  2. This is one of several Symmetric Gregorian Martian calendars, which generally have the following characteristics:

  3. Other types of 12-month calendars are:

Document Mars Time
Elysium Mars
Calendar Calendar
Martian Time

Martian Time

Martian Time Survey

Martian Time Survey 2.2