The Heron Calendar at a Glance

Notes:

1. This is a variant of the Darian calendar. Differences are:

   • All weeks contain seven days, making the calendar non-perpetual.

   • Begins 13 days after the winter solstice, instead of on the vernal equinox.

   • Uses an alternative system of month and day names.

2. The zodiacal months are set so that the vernal equinox occurs in Ariesmon, in keeping with the convention on Earth, thus these months are not synchonized with the passage of the sun through the corresponding constellations.

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

   • Divide the Martian year into 24 months of approximately equal in duration to encompass the longer Martian year.

   • Retain the seven-day week.

   • Begin the year near the Winter solstice

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

   • Base the month names on the traditional Roman names, plus some additional naming scheme

4. Other types of 24-month calendars are:

   • Asymmetric Vernal Equinox Martian calendars

   • Symmetric Summer Solstice Martian calendars

   • Symmetric Vernal Equinox Martian calendars

	An Easily Understood Calendar and Time System for Mars Leon G. Heron
	Calendar
	Martian Time
	Martian Time Survey 2.2