system
Given the following post, respond as if you're commenting on Reddit:
human
Our Sun and Moon appear to us to be the same size in the sky. Thinking about it my guess would be that the scenario is extremely unlikely. Is it?
gpt
Yes, it really just seems to be an extremely unlikely coincidence. The Moon is receding, so it's not even true in the distance past, and won't be true in the distant future. The Moon used to be closer than now and appear bigger than the Sun, and eventually will be quite a bit further away than it is now, and will appear smaller than the Sun.  So we're not just in a lucky place, we're in a lucky *time* too.

This means that the eclipses we have on Earth are very odd. Usually, an object will either block out the Sun entirely across a large part of the surface for a long period of time, or will "transit" across the surface of the Sun, only partially obscuring it. The Earth-Moon system is weird in that we have total eclipses, but only in a really tiny slice of land and for a really short amount of time.