system
Given the following post, respond as if you're commenting on Reddit:
human
Is there an actual reason the Sun and the Moon are the same size in the sky?

In school, I was taught that it was just a coincidence that the Sun and Moon are the same size in the sky but it seems like such a rare coincidence, there'd have to be a reason, wouldn't there?
gpt
It is a coincidence. Both of them fluctuate in apparent size throughout the year, so they're not always the exact same size (which is why there are different kinds of solar eclipses). The moon is gradually getting farther away and the sun is gradually getting bigger, so eventually they won't be as close in size.