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As the earth orbits the sun over the course of a full year, the side of earth in darkness (night) will face out toward a different direction. The winter constellations are those that are in line extending from the sun through earth out into the galaxy during winter, and the summer constellations are those on the opposite side of the sun. Therefore, during different seasons you are actually seeing different parts of the universe due to earth orbiting the sun.
Because in the summer the constellation would be in the daytime sky.
The winter night sky is the opposite direction from the summer night sky. The constellations you see in winter are on the other side of the sun in summer, so you would only see them in summer during a total solar eclipse.
It is both, as Cassiopeia is one of the constellations that can be seen all year round.
The constellations change position because of the same reason the days range in length from summer to winter. The Earth's tilt and wobble. The constellations stay in the same place in the sky, but every day the Earth moves while the tilt stays the same, leaving it to appear that the constellations have moved. (It's better to understand with a picture..)
Most constellations are seasonal, meaning they appear in the sky during reasonable evening hours only at certain times of the year. For example, Orion is a popular winter constellation. Only circumpolar constellations are not seasonal.
Earth rotates on its axis.
because of the revolution
In the northern hemisphere the constellations on the meridian on June 21 have a right ascension of 18 hours, and constellations from 15 to 18 hours can be seen in summer evenings. They are not as bright as the winter constellations. The main ones are Boötes (main star Arcturus), Corona Borealis, Serpens Caput, Libra, Hercules and Ophiuchus. In the southern sky, Scorpio (main star Antares). In the summer the circumpolar constellations like Cassiopeia, Ursa Major, Perseus and Draco can be seen although not in their usual winter positions.
There are handful of constellations thought of as "Winter constellations" - you would have to specify the name of the constellation.
The Earth is tilted. As it goes around the sun we see different areas of the sky during the year.
Great question - you would see the same constellations in the sky on a Winter day that you would see in the sky on a Summer night. And there are too many to mention here - almost 40+ constellations.