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The siriometer is a rarely used astronomical measure equal to one million astronomical units, i.e., one million times the average distance between the Sun and Earth.[1] This distance is equal to about 149,597,870,000,000,000 meters (149.6 Pm) or about 15.813 light-years, which is roughly twice the distance from Earth to the star Sirius.

It was proposed in 1911 by Carl V. L. Charlier.[2]

The proposed symbol for the siriometer is (Sm).


  • On the units of distance in stellar astronomy, Malmquist, K. G., The Observatory, Vol. 48, p. 142-144 (1925) [1]
  1. ^ "WolframAlpha". Retrieved 25 April 2012. 
  2. ^ Lectures on Stellar Statistics. Charlier. 1921