system
Given the following post, respond as if you're commenting on Reddit:
human
A day is 24 hours. Earth's rotation is 23. 56 and change. Where do those 4 minutes go? And why isn't the time scale divided so it's 24 hours exactly?
gpt
You have to decide what your reference point is: the 23hrs 56 minutes is the time it takes the earth to rotate 360 degrees. But it takes four more minutes for the earth to rotate on around to where the sun is at the same place in the sky, because the earth is also revolving around the sun at a rate of 1/365.25th of a revolution per day. There are 1440 minutes in  a day, and 1440/365.25=3.943

Hope that helps.