Keywords |
  • Universe,
  • Physics


A parallax is a periodic shift in the apparent positions of nearby stars due to the changing position of the Earth in its orbit around the Sun. The closer the star, the greater the shift. The distance of a star in parsecs is simply 1/parallax, (i.e. in light-years, 3.2616/parallax) if the parallax is expressed in seconds of arc.

Credit: Rennes Astronomy Society Credit: Rennes Astronomy Society



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