Article · Wikipedia archive · Last revised May 30, 2026

Spat (angular unit)

The spat, from the Latin spatium ("space"), is a unit of solid angle. One spat is equal to 4π steradians or approximately 41253 square degrees of solid angle. Thus 1 sp is the solid angle subtended by a complete sphere at its center.

Last revised

May 30, 2026

Read time

≈ 1 min

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111 w

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7

Source

The spat (symbol sp¹), from the Latin spatium ("space"), is a unit of solid angle.²³ One spat is equal to 4 $π$ steradians¹³ or approximately 41253 square degrees of solid angle (sequence A125560 in the OEIS).² Thus 1 sp is the solid angle subtended by a complete sphere at its center.²

See also

See also

Turn (angle) — the plane angle counterpart of the spat, equivalent to 2 $π$ radians

References

References

The Ultimate Online Reference for Engineers. Sunnyvale, California, USA: eFunda Inc. Retrieved 2015-10-19.
Rowlett, Russ (2018). "A Dictionary of Units of Measurement". Chapel Hill: University of North Carolina. Retrieved 2024-07-10.
Glossary » Units » Solid Angle » Spat. Sunnyvale, California, USA: eFunda Inc.