Who correctly first explained the reason why you can see certain constellations only in certain seasons?

Question

Of course, only heliocentric model can explain this. But, was this Copernicus himself or Galilei?

Answer 1

Your statement about heliocentric model is wrong. Everything we see in the sky with a naked eye is perfectly explained by geocentric model as well. The reason why we see different constellations in different seasons, is that the Sun does not occupy a fixed position with respect to the stars, and moves along the ecliptic making one turn per year. All the earliest writers on astronomy that we know already knew this. Without this knowledge one cannot make a reasonable calendar. As the calendar is indispensable to those who do agriculture, there is no doubt that his was discovered at the time when people started agriculture, that is in pre-historic period.

Of course, there can be different meanings of the word "explain". One can ask "why the Sun moves as it does"? This was "explained" by the Law of Universal gravity (proved by Newton). But why to stop here, one can also ask "why the Law of gravity" is as it is? And so on.