It looks like you are discussing how the movement of stars is perceived from Earth due to our planet's rotation and orbit around the Sun. Here's a clearer explanation based on your points:
-
Apparent Movement of Stars: Stars appear to move across the night sky because the Earth spins on its axis. This rotation causes celestial objects to rise in the east and set in the west. For observers in the eastern United States, stars will seem to move in a specific path across the sky, which can also be observed by those at the same latitude in the western United States, albeit at different times due to Earth's rotation.
-
Location of Stars: As the Earth orbits the Sun throughout the year, our viewpoint of the night sky changes. This means that over time, different stars become visible in the night sky. In fact, during the course of a year, given a fixed location on Earth, you will gradually be able to observe nearly all the stars that are visible from that location. The position of these stars will vary by season and time of night due to Earth's axial tilt and orbital motion.
Overall, the combination of Earth's rotation and its orbit around the Sun is responsible for the changing visibility and apparent movement of stars in our night sky.