This is just my own thinking here, so there won't be any facts or links or things like that. So those who can't read posts without those, are advised
to stop reading this post and go do something else.
I don't know where the "three days of darkness" comes from, nor have I researched it at all.
But it occurred to me that solstices always take about three days to start turning around. I mean, during the winter solstice, there will be three
days of equal darkness (the darkest time of the year), before the days will start having more (and brighter) light.
Same goes in reverse for the summer solstice - there are three days of 'brightness'. There are three days of equal brightness (the brightest time of
the year), before the days will start having less (and dimmer) light.
This is of course a relative thing, because those who live in or near enough to the equator, don't really get the dark and light times of the year -
for them, the light it's probably always equally bright, and equally long, every day.
So perhaps that was just someone's way of pinpointing the exact TIMEFRAME when the galactic alignment happens. "Oh, it happens when there's three days
of darkness". That doesn't mean that they daytime is any darker than usually this time of year, but it means that it is the DARKEST time of the year,
so the light will be most dim, there will be the least amount of it, and it will last for three days.
That's just a thought that occurred to me, and without more information, at this point, I am thinking that this could be plausible. Of course, if I
knew more about where that idea came from, who said it, or where it was originally written or said, and what other things might have been said with
it, I could confirm my theory's likelihood one way or another.
edit on 18-12-2012 by Shoujikina because: (no reason given)