Hi Alan

> On Oct 12, 2022, at 5:55 PM, Alan Braslau via ntg-context 
> <ntg-context@ntg.nl> wrote:
> \unit{135℃} adds a space after the digits 135.
> I do not believe that this is correct
> (for ℃ is *not* a "real" unit, unlike \unit{408.15 K} which *is* a real
> unit).

According to “Scientific Style and Format: The CSE Manual for Authors, Editors, 
and Publishers, 8th Ed.” by the Council of Science Editors:

> The symbol for degrees Celsius, ℃ (not simply C), is separated from the 
> number on its left by one space, whereas the degree symbol for a plane angle 
> (e.g. a 45° angle) and for longitude and latitude (e.g. 45°30’N) is not 
> separated from the numeral by a space. [§ SI Rules, pp.169-170]

As a recovering string theorist, I cannot help but speculate that this rule 
extends to spherical coordinates in any number of dimensions. However, if you 
don’t want the space, you can use 135\unit{℃}, which does not add a space.

> Also,
> \unit{135°C} drops the "C". Is this a parsing bug?

It is not a parsing bug; it is a limitation. In general, units must be spelled 
out (newton, joule, etc.) which produces the correct SI symbol (N, J, etc.). 
Some units are also recognized by their symbols (m, s, kg,…). Celsius is 
recognized by the single character “℃” and by the name “celsius”, but not by 
the two character combination “°C”. Probably, the parser could be expanded to 
recognize the two character combination. That requires mucking around in 
phys-dim.lua, which I’m not going to touch.

Use \unit{135 celsius} if you want the space, and 135\unit{celsius} if you 
don’t. Or you can add your favorite abbreviations:


Then use \unit{135°C} if you want the space and 135\unit{°C} if you don’t.

> Related,
> \unit{90°} does not seem to introduce a space, as indeed it should not.

Also related, using \unit for just the units, and not the number, is useful 
when they follow something that is not a number, like a vector: $ \vec v = 
(4.0, -3.2, 1.5)\unit{m/s} $. You frequently do not want a space in that 

Now that I’ve had this success messing with other people’s code, I’ve got your 
luagraph module on my mind.

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