DFWallace in his afterword for Wittgenstein’s Mistress (aptly, partially entitled The Empty Plenum) READ IT
discusses interpretations of the heroine’s menstruation.
For those of you who have not experienced the phenomenon of bleeding, involantarily, without clotting, at varying rates, 24 hrs a day for like 6 days, two things to consider from someone who does know this:
We can track time by bleeding much more easily than by the moon cycle (it has been suggested those are correlated). Men folk had to do math and sheet and navigate by stars?
Additionally, she could get approximate self-age by the presence of absence of