Taco Hoekwater

David Kastrup wrote:

So I recommend that you change the ratio of nd either to 1370:1284 (which reinstates the 12nd=1nc relation), or better change it to the

I picked that choice for luatex. People would be awfully confused if 12pt!=12pc,

I'd be confused it it were...

so I suspect the same is true for nds and ncs (assuming anyone actually uses these units, which is doubtful at this stage).

I'd probably prefer the more exact value 11183:10481. Both nc and nd don't exist in the wild, they are only abstract ratios inside of TeX. If people specify a value in the smaller unit nc, they presumably want to have it heeded as well as possible. But since those values differ only in the seventh place, the five-digit precision of TeX's "scaled" values will probably make that difference irrelevant for most applications. Your choice makes x nd equivalent to 12*x nc, where x is a "scaled" 15.16 fixed point number from TeX. I have the sneaking suspicion that Knuth might have known about these units and decided not to put them into TeX since they did not have convenient exact ratios like the others. -- David Kastrup