The Coletti Calendar at a Glance

Notes:

1. There are six types of years (ignoring phase-shifting of the days of the week--if this is considered, there are 42 types of years). Nonus has 56 days in even years. Secundus has 56 days in every 11th year. Sextus has 56 days every 850th year. Thus:

1. In odd common years (668 days), Secundus has 55 days, Sextus has 55 days, and Nonus has 55 days.

2. In even common years (669 days), Secundus has 55 days, Sextus has 55 days, and Nonus has 56 days.

3. In odd leap years (669 days), Secundus has 56 days, Sextus has 55 days, and Nonus has 55 days.

4. In even leap years (670 days), Secundus has 56 days, Sextus has 55 days, and Nonus has 56 days.

5. In every 850th year (670 days), Secundus has 55 days, Sextus has 56 days, and Nonus has 56 days.

6. Every 9350th year (671 days), Secundus has 56 days, Sextus has 56 days, and Nonus has 56 days.

2. The epoch contains a slight error. Although Allison's work is used as a basis, Coletti defines his epoch as 1873 Dec 29 00:00:00 UTC, whereas midnight on the Martian prime meridian actually occurred at 1873 Dec 29 12:02:23 UTC.

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

   • Divide the Martian year into 12 months of approximately equal duration.

   • Retain the seven-day week.

   • Begin the year near the Winter solstice

   • Place the leap day(s) in the second month.

   • Base the month names on the traditional Roman names

4. Other types of 12-month calendars are:

   • Asymmetric Gregorian Martian calendars

   • Asymmetric Zodiacal Martian calendars

   • Symmetric Zodiacal Martian calendars

	A Calendar for Mars Vinicio Coletti
	Calendar
	Martian Time
	Martian Time Survey 2.2