system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the new day start at midnight, when its still dark? Wouldn't it make more sense for the day to start at, say, 6am, since that's about when the sun rises?
gpt
While this is just guessing- there is really only one firm time of the day that's easily measurable. That's noon. Its when the sun is highest in the sky. Sunrise and sunset change with the seasons and lattitude. Noon only changes with longitude. As noon is easy to establish everywhere and as it breaks the daylight hours into two equal portions the night-time can also be segmented by 1200 midnight, which segments the dark into two.