Hi there
user
Hello! How can I help you today?
assistant
I'm learning about Earth in school. Can you tell me how long it takes for Earth to rotate once?
user
Earth takes 24 hours to complete one rotation on its axis, which is why we have day and night.
assistant
That makes sense. What about its orbit around the sun? How long does that take?
user
Earth takes 365.25 days to complete one revolution around the sun, which is why we have a leap year every four years.
assistant
I see. So, that's why we have 365 days in a year, but sometimes it's 366.
user
Exactly, that extra quarter of a day adds up over time, so we add an extra day to the calendar every four years to stay in sync with Earth's orbit.
assistant