RE: 116v: the "plummeting stone"
-JKP- > 09-12-2017, 05:48 AM
Koen the handwriting with the marginalia could be 16th or 17th century. Paleography is a very broad and deep discipline, it's necessary to specialize, so I don't know handwritings later than about 1540 well enough to pinpoint the dates. I can usually give a reasonable estimate, however (not all the time, but about 75% of the time), if it's later, after Gothic cursive died out. Around 1820 I start recognizing them again, but I am less familiar with those between c. 1540 and 1820.
I hadn't thought about the flying stone maybe being a comet, but it did occur to me that it might be illustrating gravity, a topic common to many medieval manuscripts.
My two favorite depictions of medieval gravitational forces concepts are the four giant men standing on the Earth on four different sides, with their feet firmly anchored on the ground, but a better one, I think, and possibly my favorite so far, is the one where stones are being dropped from four different sides and plummeting into the center of the Earth.