How do astronomers measure distance to nearby stars?

1 Answer
May 5, 2018



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 = 1/p#

For further details and information, see this.