When I was skilling up synthesis I followed this thing for a while.... Did some synths while following it and then some while not following it, and really noticed no difference..
I'm a card-carrying crafting aetheist. If people get good results off following this it's random, there's been no empirical study to show that there's a significant correlation between day/direction/moonphase and results.
I mean that's 3 factors you'd have to account for, and 1000's of synths you'd have to do at various levels to test for.
Anyways if it works for you, great. However no one should feel that they have to buy into it...