Triangulation of a star's position

  • Apparent shift of foreground objects with respect to the background due to a change in perspective
  • Used to determine the distance of stars from the Earth
  • Provides proof that the Earth orbits the Sun


  • $D = \frac{1}{p}$
    • $D$ is distance in parsecs
    • $p$ is the parallax angle in arcseconds

Space Astronomy