In a clear night sky, which constellations can't be seen at the same time (provided that all constellations should be visible in theory as long as the field of vision is far enough on earth or in spac

In a clear night sky, which constellations can't be seen at the same time (provided that all constellations should be visible in theory as long as the field of vision is far enough on earth or in space) The landlord's problem depends on the location first, because the starry sky in the southern hemisphere is invisible in the northern hemisphere, and vice versa. Almost all the stars can be seen in the equatorial region. Let's talk about seasons. For example, in China, Scorpio is the representative of the summer sky, while Orion is the representative of the winter sky. You won't see these two constellations in the sky at the same time. As Du Fu wrote: "Friends meet each other, almost like the star of the morning and evening" (referring to the star of Orion, referring to the alpha star of Scorpio), which is the result of the annual apparent movement caused by the revolution of the earth.