Spat (unit)

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The spat (symbol sp), from the Latin Spatium ("Space") is a unit of solid angle. 1 spat is equal to 4π steradians of solid angle. As such, it is the solid angle of a sphere.

The spat is also an obsolete unit of distance used in astronomy. It is equal to one billion kilometres (1 Tm or 1012 m). It is about 1.057×10-4 light-years or 3.240×10-5 parsecs.


  • Nouvelle encyclopédie du monde, Éditions Leland Ltée. (Librairie Aristide Quillet), Montréal/Toronto/Paris, 1962, vol. 16, p. 5426

References: A Dictionary of Units of Measurement, Russ Rowlett and the University of North Carolina at Chapel Hill, The Ultimate Online Reference for Engineers, eFunda Inc., Sunnyvale, CA