You should know this ahead to fully enjoy that beauty of compact, mathematically sound week chart, and perhaps the accompanying momentary illusion that world makes sense again.
The next opportunity to enjoy most compact possible calendar page will be in 2038, so don’t miss it!
(Bonus: if you notice that 1st week is week 5 so apparently January 2027 also has 4 weeks–what gives? That’s because in ISO week numbering, first three days of January 2027 count as week 53 of 2026. In other words, week 1 of 2027 starts on January 4th.)
If your calendar starts with Sunday, this past February of 2026 was actually compact, and the next one is in 2037.
I was thinking of Crystal systems which would be cool because there’s 6 or 7 depending on convention. The only problem is that the “Monoclinic” would have 3-letter abbreviation of “Mon” which could be confused with abbreviation for Monday—I would challenge myself to find a way around it.
The XKCD thing is also great start. Continents would be nice, main-stream way of going about it. (I’m hopeful that people of Antarctica would not feel ripped off if they got the 7th season.)