[IronJack]

Why 31 days in some months, 30 in others, and 28 in one ... unless there are 29?

It is NOT a funcion of the lunar cycle. Some months have two full moons.

Why not 10 36-day months with one 5-day “slack week” which stands on its own?

[Red Badger]

That’s what the Romans did.................

[z3n]

I don't know this but I'm guessing early christianity dumped the true lunar calandar, and because 12 months doesn't fit neatly into the year like 13 months of exactly 4 weeks each (plus a day or two extra), they had to add a few days to each month. Why the differences for each, I don't know either. To me, all the months being exactly 4 weeks each would be much neater. The 14th of every month would land on the same day all year long. The math would be much cleaner too. Superstitions i guess. heh ¯\_(ツ)_/¯

[MtnClimber]

Why 31 days in some months, 30 in others, and 28 in one ... unless there are 29? It is NOT a funcion of the lunar cycle. Some months have two full moons. Why not 10 36-day months with one 5-day “slack week” which stands on its own?

It is because the calendars would be wrong if it were any other way.

[sparklite2]

Sounds like something they would have, and probably did, tried to change during the French Revolution.

It is also of interest why Sept, Oct, Nov, and December are named the seventh, eight, ninth, and tenth months while actually ranking 9 10, 11, and 12.

[who_would_fardels_bear]

How about 13 28-day months with one or two days of New Year celebrations?

[hanamizu]

The Romans thought of February as an unlucky month. When they decided to honor Julius Caesar with his own month they took a day from February to make July a long month. Same thing happened when they honored Augustus with his own month. Might as well get rid of February as quickly as possible.

[publius911]

Why not 10 36-day months with one 5-day “slack week” which stands on its own?

Because that doesn't deal with the pesky extra 1/4 day each year...