Ahh, the somewhat weird event we have every four years because the Earth can’t follow the precision of a Cesium atom!
I wonder how long it really took Astronomers and other related Scientists to figure out the compromise of getting an extra day into the system? Legend has it the Egyptians already knew the world’s revolution was 365 days while other cultures stuck with the lunar-based calendar; they say Cleopatra convinced Julius Caesar to make the shift.