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.

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