Original thread now sadly unavilable:
https://twitter.com/Foone/status/1066547670477488128
Someday aliens are going to land their saucers in a field somewhere in New Jersey and everything is going to go just fine right up until we try to explain our calendar to them "yeah we divide our year into a number of sub units called 'months' made up a number of days, and they're not all the same length"
"I guess that's unavoidable, if your rotations-count per orbit is a prime number"