Are the constellations in the northern hemisphere the same as those in the southern hemisphere?

It's different! Let's put it this way: when you are on the equator, you can theoretically see all the constellations in the whole day (assuming the atmospheric environment is very good). If you go south to 1 latitude, you will never see the stars above 89 degrees in the northern hemisphere. If you stand at the south pole (90 degrees south latitude), you will never see the constellation of the whole northern hemisphere (above 0 degrees north hemisphere). Otherwise, I don't know where you look at the stars in the northern hemisphere. City If you are in Beijing, which is 40 degrees north latitude, then the celestial sphere is above the southern hemisphere (90-40)=50 degrees, and you can't see the stars. It is best to use a picture to understand.