The primary reason is that 13 is prime. 12 is a better number in this case for a few reasons. 12 is what we already have. So nothing would have to change in th

The primary reason is that 13 is prime. 12 is a better number in this case for a few reasons. 12 is what we already have. So nothing would have to change in that regard. We could keep the names as they are, despite the fact they are out of order as it is. I used to think the same way, but after seeing this calendar, it would be easier to integrate this into what we currently have, just the amount of days have changed. And, this calendar would work well with businesses. Most businesses are based on quarters. Not that it is significantly more difficult to track 13 weeks (they would be static after all), the pushback would be less, arguably. And the world calendar is cyclical, just on a quarterly scale, rather than a monthly scale. I'd argue the monthly cycle makes more sense. But the math of the Earth's rotation doesn't make for a nice calendar. I feel the world calendar would be easier to integrate, and a little nicer (I am a huge advocate for base 12 anyway, that's always been a big hangup for me for the international fixed calendar).