steradian
| Symbol: | sr |
| Category: | Solid angle |
| SI Equivalent: | 1 sr |
| Dimension: | W |
| System: | SI |
| Notes | |
| Unit used to measure solid angle in the SI system. It is defined as the solid angle of a sphere subtended by a portion of the surface whose area is equal to the square of the sphere's radius. The total solid angle around a point is equal to 4p. | |
1 sr =
| Solid angle | ||
| Symbol | Unit Name | |
| 7.95775×10-2 | sp | spat |
| 1.18181×107 | sq ' | square arcminute |
| 4.25452×1010 | sq " | square arcsec |
| 3282.85 | sq ° | square degree |