# How do astronomers measure distance to nearby stars?

May 5, 2018

Parallax.

#### Explanation:

Parallax is a technique that is used to figure out the distance to a star. It involves viewing the same object (a star in this case) from two different perspectives. This is a difficult procedure and is commonly done by viewing the object of interest when Earth is in opposite positions in its orbit around the Sun.

Once the parallax angle $p$ has been determined, distance $d$ is simply the inverse:

$d = \frac{1}{p}$

For further details and information, see this.