Difference between Standard Parallel and Parallel of Origin

[LongLats]

Can anyone tell me the difference, if any?

[Arm out the window]

I just googled it and according to the reasonably authoritative looking page I found, the parallel of origin is midway between the two standard parallels used to make a Lambert's Conformal.

It goes on to say that the scale is correct on the standard parallels and is smallest on the parallel of origin.

[Checkboard]

Have a look here - especially at post #12:

http://www.pprune.org/dg-p-general-aviation-questions/433803-atpl-navigation-question.html

[LongLats]

Ahh cheers, thanks heaps.