system
Given the following post, respond as if you're commenting on Reddit:
human
Is it coincidence or simple logic that during both a lunar and solar eclipse the moon and sun respectively are almost perfectly eclipsed?

The earth's shadow is just about the same size as the visible surface of the moon and the moon's apparent size is just about the same as the sun's apparent size. Would this be the case in any planet/moon/star setup or is that just plain silly? Could the earth's shadow just as easily have been a spot on the moon's surface?
gpt
"The earth's shadow is just about the same size as the visible surface of the moon" -- this part is not correct, actually earth's shadow at moon's distance is larger than the moon, so lunar eclipses do not have the tight fit as the solar eclipse.  
The moon's apparent size versus the sun is a coincidence.