As I’ve shown in the past, f68r1 depicts the Great Comet of 1533 as it was seen on 18 July 1533.
Recently I questioned why it is there? What connection does it have with the central event of f68r3? Now I know. On f68r3 the moon is shown in an astrological position of 07Taurus, and in conjunction with Almach, also at 07Taurus.
f67v1 is Tycho’s supernova of 1572, and f68v2 shows the framing stars. SN1572 was also at an astrological postion of 07Taurus.
Advancing the comet’s movements revealed it passed within 2° of the supernova’s position on 25 July 1533, and pointed at where it would appear. The accompanying picture from Starry Night shows the movement.
This was not a prediction, but evidence the Voynich was created at a later date.