The Suran Leap Day/Skip Day Calendar at a Glance

Notes:

1. Each month begins on the first day of the week.

2. The calendar is similar in structure to the Darian calendar, but was developed independently. Differences are:

   • The 12th month contains only 21 days, while all others contain 28 days.

   • Intercalary days follow the 6th, 18th, and 24th months. The leap day, which is also intercalary, follows the 12th month.

   • Uses a different intercalation scheme.

   • Begins on the winter solstice.

   • Uses a different system of month and day names.

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

		A Calendar for Mars Josef Šurán
		Suran Leap Day/Skip Day Calendar
		Suran Leap Week/Skip Week Calendar
		Martian Time
		Martian Time Survey 2.2