@JonathanGregory thanks for these improvements!
> Since you too find the terms not obvious, maybe it would help the reader to 
> acknowledge this, for instance by appending a sentence after "so that order 
> of operations is essential in achieving accurate results", such as "(The two 
> axes are conventionally called the sweep-angle and fixed-angle axes; we 
> adhere to this terminology, although many find these terms rather 
> confusing.)" Then at least the reader won't be surprised to be confused.

I've phrased this as follows in cfb37b1:
> The two axes are conventionally called the sweep-angle and fixed-angle axes; 
> we adhere to this terminology, although some find these terms confusing, for 
> the sake of interoperability with existing implementations.

> The diagram in the PROJ document is helpful and it's fine to leave it there. 
> I didn't look at it the first time because it sounded as though it was just 
> about the software. Could you rephrase this sentence as "Explanatory diagrams 
> for the projection may be found on the PROJ website, as well as notes on 
> using the PROJ software for computing the mapping"?

Done in 0f1f8f39.

> The `sweep_angle_axis` and `fixed_angle_axis` attributes should be added to 
> Table F.1; `perspective_point_height` is already there. In the table, you can 
> state their two possible values and that each is optional if the other is 
> present.

Done in dd75623.

> In general CF attributes with a prescribed list of possible values are 
> regarded as case-insensitive, for ease of use of the convention, since 
> insisting on either upper or lower case will probably mean some people will 
> write incorrect files. I think we may have a general statement about that 
> somewhere. If your x and y are case-insensitive, it would be helpful to say 
> so.

Done in 9511395.

Best regards,
Daniel

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