The Hartmann Calendar (perpetual)

Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa
January 1 2 3 4 5 6 7 April 1 2 3 4 5 6 7 July 1 2 3 4 5 6 7 October 1 2 3 4 5 6 7
8 9 10 11 12 13 14 8 9 10 11 12 13 14 8 9 10 11 12 13 14 8 9 10 11 12 13 14
15 16 17 18 19 20 21 15 16 17 18 19 20 21 15 16 17 18 19 20 21 15 16 17 18 19 20 21
22 23 24 25 26 27 28 22 23 24 25 26 27 28 22 23 24 25 26 27 28 22 23 24 25 26 27 28
29 30 31 32 33 34 35 29 30 31 32 33 34 35 29 30 31 32 33 34 35 29 30 31 32 33 34 35
36 37 38 39 40 41 42 36 37 38 39 40 41 42 36 37 38 39 40 41 42 36 37 38 39 40 41 42
43 44 45 46 47 48 49 43 44 45 46 47 48 49 43 44 45 46 47 48 49 43 44 45 46 47 48 49
50 51 52 53 54 55 56 50 51 52 53 54 55 56 50 51 52 53 54 55 56 50 51 52 53 54 55 56
February 1 2 3 4 5 6 7 May 1 2 3 4 5 6 7 August 1 2 3 4 5 6 7 November 1 2 3 4 5 6 7
8 9 10 11 12 13 14 8 9 10 11 12 13 14 8 9 10 11 12 13 14 8 9 10 11 12 13 14
15 16 17 18 19 20 21 15 16 17 18 19 20 21 15 16 17 18 19 20 21 15 16 17 18 19 20 21
22 23 24 25 26 27 28 22 23 24 25 26 27 28 22 23 24 25 26 27 28 22 23 24 25 26 27 28
29 30 31 32 33 34 35 29 30 31 32 33 34 35 29 30 31 32 33 34 35 29 30 31 32 33 34 35
36 37 38 39 40 41 42 36 37 38 39 40 41 42 36 37 38 39 40 41 42 36 37 38 39 40 41 42
43 44 45 46 47 48 49 43 44 45 46 47 48 49 43 44 45 46 47 48 49 43 44 45 46 47 48 49
50 51 52 53 54 55 56 50 51 52 53 54 55 56 50 51 52 53 54 55 56 50 51 52 53 54 55 56
March 1 2 3 4 5 6 7 June 1 2 3 4 5 6 7 September 1 2 3 4 5 6 7 December 1 2 3 4 5 6 7
8 9 10 11 12 13 14 8 9 10 11 12 13 14 8 9 10 11 12 13 14 8 9 10 11 12 13 14
15 16 17 18 19 20 21 15 16 17 18 19 20 21 15 16 17 18 19 20 21 15 16 17 18 19 20 21
22 23 24 25 26 27 28 22 23 24 25 26 27 28 22 23 24 25 26 27 28 22 23 24 25 26 27 28
29 30 31 32 33 34 35 29 30 31 32 33 34 35 29 30 31 32 33 34 35 29 30 31 32 33 34 35
36 37 38 39 40 41 42 36 37 38 39 40 41 42 36 37 38 39 40 41 42 36 37 38 39 40 41 42
43 44 45 46 47 48 49 43 44 45 46 47 48 49 43 44 45 46 47 48 49 43 44 45 46 47 48 49
50 51 52 53 54 55 56 50 51 52 53 54 55 56 50 51 52 53 54 55 56 50 51 52 53 54
Key to Equinoxes, Solstices, Apsides, and
Leap Sols in the Calendar Tables

1Vernal Equinox
13Aphelion
28Summer Solstice
10Autumnal Equinox
13Perihelion
13Winter Solstice
28Leap Sol

 NOTE: Dates shown for these events will vary due to intercalation.

Document Excerpts from Mars Underground
William K. Hartmann
Summary Summary
Martian Time

Martian Time

Martian Time Survey

Martian Time Survey 2.2