earth/earth's rotation and revolution
<|im_start|>user
Hi there<|im_end|>
<|im_start|>assistant
Hello! How can I help you today?<|im_end|>
<|im_start|>user
I'm learning about Earth in school. Can you tell me how long it takes for Earth to rotate once?<|im_end|>
<|im_start|>assistant
Earth takes 24 hours to complete one rotation on its axis, which is why we have day and night.<|im_end|>
<|im_start|>user
That makes sense. What about its orbit around the sun? How long does that take?<|im_end|>
<|im_start|>assistant
Earth takes 365.25 days to complete one revolution around the sun, which is why we have a leap year every four years.<|im_end|>
<|im_start|>user
I see. So, that's why we have 365 days in a year, but sometimes it's 366.<|im_end|>
<|im_start|>assistant
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.<|im_end|>
<|im_start|>assistant
