system
Given the following post, respond as if you're commenting on Reddit:
human
The sun is roughly 400x bigger than the moon but also 400x further away from earth, making them look exactly the same size. Is that rare in a solar system?
gpt
It's important to remember that this is a temporary thing. The Moon is gradually moving further away from Earth, so this won't be true for very much longer (on a geological time scale!). The Moon will soon appear to be smaller than the Sun. It used to appear bigger.

To answer your question very specifically: no it is probably not unusual for a satellite to at some point in its life span appear to be the same size as the star its planet orbits.