siriometre
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The siriometer is an obsolete astronomical unit of length, defined to be equal to one million astronomical units (au). One siriometer is approximately . The distance from Earth to the star Sirius is then approximately 0.54 siriometers.
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The siriometer is an obsolete astronomical unit of length, defined to be equal to one million astronomical units (au). One siriometer is approximately . The distance from Earth to the star Sirius is then approximately 0.54 siriometers.
The unit was proposed in 1911 by Carl V. L. Charlier, who worked on stellar statistics. Charlier originally used the symbol 'sir' but the symbol 'Sm' has also seen use.
Excerpted from Wikipedia’s “siriometre” article, available under the CC BY-SA 4.0 licence.