Here's how it works:
* Parallax: As the Earth orbits the Sun, our perspective on distant stars changes slightly. This shift in perspective causes the apparent position of stars to change slightly over the course of a year. This tiny shift is called parallax.
* Measurement: By carefully measuring the angle of this shift, astronomers can calculate the distance to the star.
* Confirmation: The observed parallax of stars provides strong evidence that the Earth is indeed moving, and that it is orbiting the Sun.
This method of measuring distances is known as triangulation and is a fundamental tool in astronomy.
