There’s a nice article about it here:
I don’t know a lot about the different types of calendars, I think there is one calendar where they add a week to the calendar every several years.
We have leap year because it takes slightly more than 365 days for the Earth to orbit the sun.
I’m up early this morning. Last night I had a dream about music, everyone had to play it perfectly. I did some upgrades to my Linux computer and I am getting ready to make coffee. I was thinking I’d go back to sleep but I guess not.