This seems like a rebrand on the International Fixed Calendar[1] proposed in 1902. The idea was to shorten every month down to 28 days create a 13th month, and have the last day of the year be an international "Year Day" holiday.
I know that complaining about typos is boring, but Neil Armstrong is consequently spelled Amstrong. Is this intentional? He's in the center of the whole calendar.
This is great! Reading the Wikipedia article on the calendar helped my understanding of what's going on a lot. Glad you added the Gregorian calendar option for translating between our dominant calendar and this.
Too bad the original proposal didn't include references to Russian astronauts, even when Russians were first to many achievements. Guess it was impossible at the time to think about including the USSR in anything, or they'd risk being seen as communists.
