[392cobra]

Yes,that is 1/2* .It needs at least that amount for the needle bearing to rotate and not flat spot.
the steeda link is how to measure.It shows a operating angle of 4* in the example.The pinion should not be pointing up as in the lower example.
The geocities link is using larger numbers because of the longer driveshaft of a CJ7.I can see why it is confusing with all the different angles in the drawing.

Study the examples in the link I posted along with the steeda link.This will get the math sorted out.

I use a gravity protractor with a magnetic base from Sears.

It is about operating angles.The difference between the driveshaft and pinion shaft,and driveshaft and trans output shaft.This two angles need to be within 1* of each other.And each seperate angle less than or equal to 3*.

The shorter the driveshaft the less operating angle the u-joint can tolerate.i.e.,the more angle,lowers the rpm of the driveshaft before it will all come apart.