The Naughton-O'Meara Calendar at a Glance

Year Published	2001
Days per Week	6-7
Days per Month	27-28
Months per Year	24
Base Year Length	668
Leap Days	1
Leap Day Position	end of year
Basic Intercalation Formula	4x668 + 6x669
Extended Intercalation Formula (\ denotes integer division)	undefined
Mean Length of Calendar Year	668.6
Base Astronomical Year	Vernal Equinox
Accuracy	106 years
Cycle of Perpetuity	28 days
Mean L_S of Beginning of Year	0.0
Year Count Start	0
Epoch (CE)	1 Jan 1
Epoch (JD)	1721424

24-Month Naming Convention	Latin zodiacal + constallations	Days
1st Month	Sagittarius	28
2nd Month	Lyra	28
3rd Month	Capricorn	28
4th Month	Cygnus	28
5th Month	Aquarius	28
6th Month	Pegasus	27
7th Month	Pisces	28
8th Month	Phoenix	28
9th Month	Aries	28
10th Month	Perseus	28
11th Month	Taurus	28
12th Month	Orion	27
13th Month	Gemini	28
14th Month	Columba	28
15th Month	Cancer	28
16th Month	Lynx	28
17th Month	Leo	28
18th Month	Hydra	27
19th Month	Virgo	28
20th Month	Crux	28
21st Month	Libra	28
22nd Month	Ursa	28
23rd Month	Scorpius	28
24th Month	Draco	27-28

Notes:

Each month begins on the first day of the week. The week at the end of each quarter contains only six days.
This is a variant of the Darian calendar. Differences are:
- The year count increments on the terrestrial cycle, which means that the number of the year changes once or twice during the Martian year, and the dates on which these changes occur varies from year to year.
- Uses an alternative system of month and day names.
This is one of several Symmetric Vernal Equinox Martian calendars, which generally have the following characteristics:
- Divide the Martian year into 24 months of approximately equal duration.
- Retain the seven-day week.
- Begin the year on the vernal equinox
- Place the leap day(s) at the end of the year.
Other types of 24-month calendars are:

	Martian Dreams Time System Linda Naughton and Robert O'Meara
	Calendar
	Martian Time
	Martian Time Survey 2.2