No, your teacher is not correct. The sun is not stationary; it is in motion. The sun is the central star of our solar system, and it plays a crucial role in the gravitational dynamics of the system. It has a massive amount of mass, which exerts a gravitational force on all the planets, moons, and other objects in the solar system.
The sun, along with the entire solar system, is also moving within our Milky Way galaxy. It takes about 225-250 million years for the sun to complete one orbit around the center of the Milky Way. This motion is not easily noticeable in our day-to-day lives because the distances and time scales involved are vast.
Additionally, the sun is not stationary even within its own system. The planets, including Earth, revolve around the sun in elliptical orbits due to the gravitational pull of the sun. This motion is what gives us the seasons and the cycle of day and night.
In summary, the sun is definitely not stationary but is in constant motion within both our solar system and the Milky Way galaxy.