The problem with the length of the year

Two timers,

1. The earth’s rotation
2. and the circling of the sun

are the actual culprits.

On New Year’s Eve for example, the earth is actually in the same position at 18:00 hours as it was a year previously at 12:00 hours, which means that approximately 6 hours or a quarter of a day is missing.

To be exact this is
5 hours 48 minutes 45,97465 seconds

decimal: 0,2421 days

These places behind the decimal point are the calendar maker’s problem! The earth on its course around the sun is in the same position at around 18:00 hours as it was a year before at 12:00 hours.

Unfortunately the moon is less practicable as a timer, because with its 12 rotations it has 354 days in the year. 11 days are missing each year for the entire year.