Spat (angular 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 (sequence A125560 in the OEIS).^[2] Thus it is the solid angle subtended by a complete sphere at its center.^[2]

The whole sphere contains ~148.510 million square arcminutes and ~534.638 billion square arcseconds.

See also

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

References

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