Speculative fraud hypothesis

[ReneZ]

it is the repetition (even with freq only 2) that needs explaining. 

Indeed, and while I can think of several things, I decided not to include too much speculation and leave it for another place. Note that I do not have any options that explains everything to my satisfaction. Far from it in fact.

If this were (part of) a bona fide star catalogue, the zodiac degrees would give the longitudes and the labels could give the latitudes. Then there would be some overlaps. (This does not work for the pharma labels).

If they are abbreviated star names (the full names are usually long), there are quite a number of stars that start the same. ("Ras ...", "Ras al ...")

If they are just references to points in the text (the stars section) the author may not have been able to (or bothered to) find unique words.

The number is a bit too high to just be explained by mistakes.

Two other curious things (not discussed in the web page) is that quite a few duplicates occur in the same sign, and that the duplicates are not at all equally divided over all signs. The second point may not be statistically significant. This is always tricky when dealing with relatively small samples.