(off topic, please help:

I'm still searching for sensus tactilis pre-dawn... I don't think it was in the Georgics, but it was from something awfully similar.

https://news.ycombinator.com/item?id=24243550

    Xena: I wake up every morning, ere the dawn is rhododactylous
          Who needs to wait for daylight? I just work by _sensus tactilis_.

any ideas?)