The Coletti Calendar (non-perpetual)

Ph De Ea Mo Ve Me Su Ph De Ea Mo Ve Me Su Ph De Ea Mo Ve Me Su Ph De Ea Mo Ve Me Su
Primus 1 2 3 4 5 6 7 Quartus 1 2 3 4 5 6 7 Septimus 1 Decimus 1
8 9 10 11 12 13 14 8 9 10 11 12 13 14 2 3 4 5 6 7 8 2 3 4 5 6 7 8
15 16 17 18 19 20 21 15 16 17 18 19 20 21 9 10 11 12 13 14 15 9 10 11 12 13 14 15
22 23 24 25 26 27 28 22 23 24 25 26 27 28 16 17 18 19 20 21 22 16 17 18 19 20 21 22
29 30 31 32 33 34 35 29 30 31 32 33 34 35 23 24 25 26 27 28 29 23 24 25 26 27 28 29
36 37 38 39 40 41 42 36 37 38 39 40 41 42 30 31 32 33 34 35 36 30 31 32 33 34 35 36
43 44 45 46 47 48 49 43 44 45 46 47 48 49 37 38 39 40 41 42 43 37 38 39 40 41 42 43
50 51 52 53 54 55 56 50 51 52 53 54 55 56 44 45 46 47 48 49 50 44 45 46 47 48 49 50
51 52 53 54 55 56 51 52 53 54 55 56
Secundus 1 2 3 4 5 6 7 Quintus 1 2 3 4 5 6 7 Octavus 1 Undecimus 1
8 9 10 11 12 13 14 8 9 10 11 12 13 14 2 3 4 5 6 7 8 2 3 4 5 6 7 8
15 16 17 18 19 20 21 15 16 17 18 19 20 21 9 10 11 12 13 14 15 9 10 11 12 13 14 15
22 23 24 25 26 27 28 22 23 24 25 26 27 28 16 17 18 19 20 21 22 16 17 18 19 20 21 22
29 30 31 32 33 34 35 29 30 31 32 33 34 35 23 24 25 26 27 28 29 23 24 25 26 27 28 29
36 37 38 39 40 41 42 36 37 38 39 40 41 42 30 31 32 33 34 35 36 30 31 32 33 34 35 36
43 44 45 46 47 48 49 43 44 45 46 47 48 49 37 38 39 40 41 42 43 37 38 39 40 41 42 43
50 51 52 53 54 55 56 50 51 52 53 54 55 56 44 45 46 47 48 49 50 44 45 46 47 48 49 50
51 52 53 54 55 56 51 52 53 54 55
Tertius 1 2 3 4 5 6 7 Sextus 1 2 3 4 5 6 7 Nonus 1 Duodecimus 1 2
8 9 10 11 12 13 14 8 9 10 11 12 13 14 2 3 4 5 6 7 8 3 4 5 6 7 8 9
15 16 17 18 19 20 21 15 16 17 18 19 20 21 9 10 11 12 13 14 15 10 11 12 13 14 15 16
22 23 24 25 26 27 28 22 23 24 25 26 27 28 16 17 18 19 20 21 22 17 18 19 20 21 22 23
29 30 31 32 33 34 35 29 30 31 32 33 34 35 23 24 25 26 27 28 29 24 25 26 27 28 29 30
36 37 38 39 40 41 42 36 37 38 39 40 41 42 30 31 32 33 34 35 36 31 32 33 34 35 36 37
43 44 45 46 47 48 49 43 44 45 46 47 48 49 37 38 39 40 41 42 43 38 39 40 41 42 43 44
50 51 52 53 54 55 56 50 51 52 53 54 55 44 45 46 47 48 49 50 45 46 47 48 49 50 51
51 52 53 54 55 56 52 53 54 55 56

Note: This table depicts only one of six types of years (ignoring phase-shifting of the days of the week--if this is considered, there are 42 types of years). Nonus has 56 days in even years. Secundus has 56 days in every 11th year. Sextus has 56 days every 850th year. Thus:

  1. In odd common years (668 days), Secundus has 55 days, Sextus has 55 days, and Nonus has 55 days.

  2. In even common years (669 days), Secundus has 55 days, Sextus has 55 days, and Nonus has 56 days.

  3. In odd leap years (669 days), Secundus has 56 days, Sextus has 55 days, and Nonus has 55 days.

  4. In even leap years (670 days), Secundus has 56 days, Sextus has 55 days, and Nonus has 56 days.

  5. In every 850th year (670 days), Secundus has 55 days, Sextus has 56 days, and Nonus has 56 days.

  6. Every 9350th year (671 days), Secundus has 56 days, Sextus has 56 days, and Nonus has 56 days.

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.

A Calendar for Mars
Vinicio Coletti
Summary Summary
Martian Time

Martian Time

Martian Time Survey

Martian Time Survey 2.2