Dynamical parallax

The Dynamical Parallax is a method of measuring the distance to a visual binary star based on the estimated masses of the two components, the size of the orbit, and the period of their revolution around one another. Sir Patrick Moore (ed.). Astronomy Encyclopædia (Revised ed.). Great Britain: Philip's. p. 120. {{cite book}}: Unknown parameter |month= ignored (help)</ref> The angular diameter of the orbit around one of the stars around each other is observed, together with their apparent brightness, and by applying Newton's generalisation of Kepler's Third Law (The squares of the orbital periods of planets are directly proportional to the cubes of the semi-major axis of the orbits) "Astronomy Knowledge Base - dynamical parallax" (HTML). Astronomy Knowledge Base. Retrieved 2006-07-18. and the Mass-Luminosity relation, the distance to the binary star can be determined.