stellar aberration

Stellar aberration is the apparent shift in the position of stars caused by Earth's motion through space. As Earth moves at high speed, our telescopes are tilted slightly forward in the direction of travel, similar to how rain appears to fall at an angle when you walk through it. This tilt causes distant starlight to seem to come from a slightly different direction than it actually does. The effect depends on Earth's speed and the star's position in the sky. Stellar aberration helps astronomers understand Earth's velocity and confirms that Earth's motion influences our view of the universe.