month names

[tavie]

Another occurrence of Germanic Aberelle/Aberil:

"Der erst tag ist ze dem ingenden aberellen an dem subent tage"

"Der and[er] tage ist in dem subende tag ze dem ussgenden maygen"

Is "maygen" Genitive for "may"? And what do "ingenden" and "ussgenden" mean?

Possibly "ingenden" is the relevant verb form of îngân or îngên (in the dative), i.e. eingehen in more modern German, and ussgenden for ûz,gên, i.e. ausgehen/ausgehenden.   April would be "incoming"; May would be on its way out, and so it could be talking about the seventh day of the "incoming" April, i.e. the start of April, and the seventh day of the end or later part of May.

Extremely unfortunately, the third paragraph, speaking presumably of September, calls it in a roundabout way "ersten herbstmanot" (first Autumn month), and does not use the literal form which would be quite of interest.

Herbsmonat did used to be a way of describing September, or the other autumn months, so I'm not surprised to see it there.  September is mentioned on page 197 in a recognizable way, as is October (and others on page 196) but it may not be the same author.

All of these are self-explanatory, except that I can't read out the Taurus (Farr ?)

I'm terrible at reading the handwriting in manuscripts, but I think you are right.  We'd expect to see something like Stier for Taurus, but Farre/Varre means bullock in MHG.