heres my guess:

Because we are in the process of a pole reversal on the sun, this means the sun will slow down. Earth will slow down as well and then ultimately stop for a bit (not too long-- I would guess just a few hours). The sun will escentially move "backwards" and set in the east. This means it will not rise for some at all. This will continue until the sun rises in the west. It is during this time that we will have the 3 days of darkness.