The Vonnegut Calendar at a Glance

Year Published 1959
Days per Week undefined
Days per Month 30-31
Months per Year 22
Base Year Length 669
Leap Days undefined
Leap Day Position undefined
Basic Intercalation Formula undefined
Extended Intercalation Formula
(\ denotes integer division)		 undefined
Mean Length of Calendar Year undefined
Base Astronomical Year undefined
Accuracy undefined
Cycle of Perpetuity undefined
Mean LS of Beginning of Year undefined
Year Count Start undefined
Epoch (CE) undefined
Epoch (JD) undefined
Month Naming Conventions Anglicized Roman + additional arbitrary Days
1st Month January 31
2nd Month February
31
3rd Month March 31
4th Month April 30
5th Month May 31
6th Month June 30
7th Month July 31
8th Month August 31
9th Month September 30
10th Month October 31
11th Month November 30
12th Month December 31
13th Month Winston 30
14th Month Niles 30
15th Month Rumfoord 30
16th Month Kazak 30
17th Month Newport 30
18th Month Chrono 30
19th Month Synclastic 31
20th Month Infundibulum 30
21st Month Salo 30
22nd Month Beatrice 30

Notes:

  1. This is one of several 22-month calendars.

  2. As originally described in The Sirens of Titan, there were only 21 months adding up to only 639 days, implying that Vonnegut forgot to mention a 22nd month. The month of Beatrice was added by Fredrik Ekman.

Document Kurt Vonnegut's Martian Calendar
Fredrik Ekman
Calendar Calendar
Martian Time

Martian Time

Martian Time Survey

Martian Time Survey 2.2