The following 11 Units are included in this category:
ID |
Unit (symbol) |
Definition |
Wikipedia page and other notes |
1 |
steradian (sr) |
- |
|
2 |
millisteradian (msr) |
10-3 sr |
https://en.wikipedia.org/wiki/Steradian Page refers to steradian, not millisteradian |
3 |
sq. degree (deg2) |
(π/180)2 sr |
|
4 |
sq. gradian (grad2) |
(π/200)2 sr |
https://en.wikipedia.org/wiki/Gradian Page refers to gradian, not square gradian |
5 |
sq. gradian (sq grad, sq gon) |
(π/200)2 sr |
https://en.wikipedia.org/wiki/Gradian Page refers to gradian, not square gradian |
6 |
spat, sphere (sp) |
4π sr |
|
7 |
hemisphere (hemisphere) |
2π sr |
|
8 |
spher. right angle (sph_right_angle) |
(π/2) sr |
|
9 |
sq. arcmin (sq′) |
(π/10,800)2 sr |
|
10 |
sq. arcsec (sq″) |
(π/648,000)2 sr |
|
11 |
sq. milliradian (sq mrad) |
10-6 sr |
|
All the above definitions of the various units are EXACT.
Note: In the above, a period (.) is used to indicate the decimal place and a comma (,) is used to separate groups of thousands.
Type of conversion relationship: DIRECTLY PROPORTIONAL (y=a∙x)
Example conversion diagram (see two units in bold above):
