Yes I could try to moderate it. I'd certainly be a neutral moderator since I'm 
quite ignorant of this! I've just read it and I have a few questions of 
clarification:

* You have a typo `thsi`.

* It would be helpful to provide a diagram to show the two circles and the two 
angles. The text description is pretty good, but a diagram would be useful too. 
I haven't really grasped why one axis is called sweep and one fixed, and why 
they aren't the other way round, since the fixed-angle axis is the one which 
moves and the sweep-angle axis is stationary. I might understand with the aid 
of a diagram.

* Adding the Earth major axis to the perspective point height gives the 
distance to the centre of the Earth only if you're above the equator, I think. 
Otherwise a different radius applies.

* I don't understand `sweep_angle_axis`. Couldn't this axis be pointing in any 
direction (in the rotating frame of the Earth)? How do we interpret `x` and 
`y`? Could it be `z`? Why not some arbitrary direction?

* For `fixed_angle_axis`, what does "opposite" mean?

Everyone is invited to comment on the proposal text in 
https://github.com/cf-convention/cf-conventions/pull/259. Please post your 
comments **here** and not in the pull request (following our GitHub 
guidelines). Thanks.

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