Spat (unit)

The spat (symbol sp[1]), from the Latin spatium ("space"), is a unit of solid angle.[2][3] 1 spat is equal to 4π steradians[1][3] or approximately 41253 square degrees of solid angle.[2] As such, it is the solid angle of a sphere.[2]

The spat (symbol S[4]) is also an obsolete unit of distance used in astronomy.[4][2] It is equal to one 1000000000 kilometres (1 Tm or 1012 m).[4][2] It is about 6.6846 astronomical units (AU),[2] 1.057×10−4 light-years or 3.240×10−5 parsecs.

See also

References

  1. 1 2 The Ultimate Online Reference for Engineers. Sunnyvale, California, USA: eFunda Inc. Retrieved 2015-10-19.
  2. 1 2 3 4 5 6 Rowlett, Russ (2004). "A Dictionary of Units of Measurement". Chapel Hill: University of North Carolina. Retrieved 2015-10-16.
  3. 1 2 Glossary » Units » Solid Angle » Spat. Sunnyvale, California, USA: eFunda Inc.
  4. 1 2 3 Nouvelle encyclopédie du monde 16. Montréal, Toronto, Paris: Éditions Leland Ltée, Librairie Aristide Quillet. 1962. p. 5426.
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