The Isakov Calendar at a Glance

Year Published 2001
Days per Week undefined
Days per Month 32-33
Months per Year 20
Base Year Length 645
Leap Days undefined
Leap Day Position undefined
Basic Intercalation Formula undefined
Extended Intercalation Formula
(\ denotes integer division)		 undefined
Mean Length of Calendar Year 645
Base Astronomical Year undefined
Accuracy < 1 year
Cycle of Perpetuity undefined
Mean LS of Beginning of Year undefined
Year Count Start undefined
Epoch (CE) undefined
Epoch (JD) undefined
24-Month Naming Conventions undefined Days
1st Month   32
2nd Month   32
3rd Month   32
4th Month   33
5th Month   32
6th Month   32
7th Month   32
8th Month   33
9th Month   32
10th Month   32
11th Month   32
12th Month   33
13th Month   32
14th Month   32
15th Month   32
16th Month   33
17th Month   32
18th Month   32
19th Month   32
20th Month   33

Note:

  1. The calendar is mistakenly based on 645 days in a Martian year. There are actually 668.6 days in a Martian year.

  2. This is one of several 20-month calendars.

Марсианский календарь
Сергей Л. Исаков
Calendar Calendar
Martian Time

Martian Time

Martian Time Survey

Martian Time Survey 2.2