The Savard Calendar at a Glance

Year Published	2002
Days per Week	7
Days per Month	29-30
Months per Year	22-23
Base Year Length	652
Leap Days	29-30
Leap Day Position	end of year
Basic Intercalation Formula	21x652 + 27x681 + 682
Extended Intercalation Formula (\ denotes integer division)	29 * [Y + (Y-1) + (Y-3) + (Y-5)]\7 + 30 * (Y\49)
Mean Length of Calendar Year	668.5918
Base Astronomical Year	Vernal Equinox
Accuracy	833 years
Cycle of Perpetuity	none
Mean L_S of Beginning of Year	0
Year Count Start	undefined
Epoch (CE)	undefined
Epoch (JD)	undefined

23-Month Naming Convention	Latin zodiacal + constallations	Days
1st Month	Aries	30
2nd Month	Germinal	29
3rd Month	Taurus	30
4th Month	Floreal	29
5th Month	Gemini	30
6th Month	Prairial	30
7th Month	Cancer	30
8th Month	Messidor	29
8th or 9th Month	Leo	30
9th or 10th Month	Thermidor	29
10th or 11th Month	Virgo	30
11th Month	Fructidor	29
12th Month	Libra	30
13th Month	Vendemaire	29
14th Month	Scorpio	30
15th Month	Brumaire	29
15 or 16th Month	Sagittarius	30
16th or 17th Month	Frimaire	30
17th or 18th Month	Capricorn	30
18th or 19th Month	Nivose	29
19th or 20th Month	Aquarius	30
20th or 21st Month	Pluviose	29
21st or 22nd Month	Pisces	30
22nd or 23rd Month	Ventose	29-30

Notes:

This system attempts to keep the beginning of the Martian month in synchronization with the beginning of the Earth month. This is done by inserting an embolismic month four times in a seven-year cycle, plus a leap day every 49 years. There are 1106 months in 49 Martian years, and a total of 32,761 Martian days, so that the mean length of the Martian month is 29.62166 Martian days. However, the average length of an Earth month is 30.43688 days (365.2425 days / 12 months per year), which is equal to 29.62252 Martian days. Due to this discrepancy, every 32.6 Martian years the Martian month would advance one day relative to the Earth month.
The months Messidor and Brumaire are omitted in common years, while Fructidor is omitted in embolismic years. The zodiacal months begin with Aries, in keeping with the convention on Earth, and are not synchonized with the passage of the sun through these constellations.