A day is the exact length of time it takes the earth to turn around one time.
A year is the length of time the earth takes to travel around the sun one time.
The Egyptians did not think about these scientific facts.
For them, 12 of their 30-day months made a year, but 360 days do not make a full year.
What did they do about these problems? They made a five-day holiday at the end of each year.
But even adding five holidays did not make the Egyptians' yearly calendar right.
It takes the earth a little more than 365 days to travel around the sun.
To be exact, it takes 365 days, 5 hours, 48 minutes and 46 seconds.
For a long time people did not add these extra hours and minutes and seconds.
Explain it to me why "and" is used between "hours and minutes" instead of comma.