Changes

<math>1 pc \approx 206,264.81 AU</math>

<math>1 pc \approx 206,264.81 AU</math>

However, the error of measurement of parallax angle is 0.005 arc seconds, and beyond a distance of 100 parsecs, this error becomes significant. 700 stars are near enough to measure their distances directly by using parallax.<ref name=Britannica3/> To measure distances further out than this, astronomers typically use absolute and relative magnitudes, or they apply Hubble's Law to the star's estimated [[redshift]].

However, the error of measurement of parallax angle is 0.005 arc seconds, and beyond a distance of 100 parsecs, this error becomes significant. 700 stars are near enough to measure their distances directly by using parallax.<ref name=Britannica3/> To measure distances further out than this, astronomers typically use absolute and relative magnitudes, or they apply [[Hubble Law|Hubble's Law]] to the star's estimated [[redshift]].

=== Positions in sky ===

=== Positions in sky ===