Should the first equation be $\theta = \frac{l}{2\pi r}$ and the second equation $\Omega = \frac{A}{4\pi r^{2}}$?
skygao
@dvernet I believe the first expression you have in there gives you the turns of the angle and not the radian. Note 1 turn = $2\pi$ rad so you are doing the right math there but you are using different units. I'm not sure if there's a counterpart for turns in a sphere but you do have steradians :)
Should the first equation be $\theta = \frac{l}{2\pi r}$ and the second equation $\Omega = \frac{A}{4\pi r^{2}}$?
@dvernet I believe the first expression you have in there gives you the turns of the angle and not the radian. Note 1 turn = $2\pi$ rad so you are doing the right math there but you are using different units. I'm not sure if there's a counterpart for turns in a sphere but you do have steradians :)