This document is part of the Martian Time Boneyard. It was originally located at
Author: Mark Knoke

The Modified Vophick Calendar

Mark Knoke

A few changes: my made-up names are out, the short months are symmetrical, Tom Gangale's leap year scheme is in, the day names have been de-soled and differentiated, July 1 is no longer the Summer Solstice.

That said, here's the new set of months:

January -- 42
February -- 42
March -- 41
Elysium -- 42
April -- 42
May -- 42
June -- 42
Olympus -- 41
July -- 42
August -- 42
Marineris -- 42
September -- 42
October -- 41
November -- 42
December -- 42
Hellas -- 41 or 42

Notice that the four 'new' months are not evenly spaced. I kept the Sept-Oct-Novem-Decem sequence together. Elysium, Olympus, Marineris, and Hellas are large features on Mars, roughly spaced 90 degrees apart from each other around the planet. Actually, Olympus Mons and Valles Marineris are a bit closer to each other, so it makes some sense that there's only two months between them. Hellas Planitia is the southern-most of the four, so it is placed when the Sun is the most southern as well: the Winter Solstice.

Speaking of the Winter Solstice, it falls near Hellas 40th every year. Sometimes it's the 39th, sometimes it's the 41st. The Vernal Equinox is on Elysium 28th or 29th. The Summer Solstice is near July 12th. The Autumnal Equinox is near October 22nd.

The days of the week are:


All nine have different starting letters, making abbreviations simpler. None of them are identical to the Earth weekdays (Sunday, Saturday, etc.), so there will be less confusion. I previously had them all as derivations from the English word for the planet, but I decided that Terraday just sounds better than Earday! I would rather not use Sol for the Sun, but Helios abbreviates the same as Hellas. Chinese and Japanese for Sun both start with T, so I'd have to go back to Earday... Raday? Apolloday? Balday? Shamaday? Ormuday? Tezcaday?

Tom Gangale's leap year scheme is basically as follows. Every year has 669 days except even years which have 668 except years divisible by 10 which have 669 except years divisible by 100 which have 668 except years divisible by 500 which have 669. ...Simpler numbers to remeber than my old scheme (but more of them?).

Had enough? Understand it all? Good!
New Year's Day for year 14 is December 28, 1999 Gregorian, so be sure to have your party hat on!

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