This calendar uses the Zoological month names, all of which come from past and present constellations.
Promotional calendar for a fictional Martian enclosure manufacturer. This is a real object I made for which the day, month, date and year are all changeable. It uses the Utopian Calendar naming convention for the months, although I use an altered system for the weekday names.
The main image on the above calendar is a classic pinup by the great Gil Elvgren, which I manipulated to give it the three joke principles of scenes from Mars: 1) the sky must be red; 2) people's skin must be slightly green; and 3) the cars must have 6 wheels.
These are both 1950s-style pinup calendars like you'd find in a mechanics garage, but using the Utopian Calendar for Mars instead of our Gregorian. Although, in the upper image, you can see the Gregorian calendar in thin, blue figures floating over the larger, black, Martian dates.