Julia Sweeney on astrology - http://www.youtube.com/watch?v=yVjturKoFsg
(The background is she just found out she was actually born 3 months after her parents told her she was born - they lied to get her to start school a year earlier.)
(The background is she just found out she was actually born 3 months after her parents told her she was born - they lied to get her to start school a year earlier.)
Of course, different near the equator, and phase-shifted in the southern hemisphere, and... much less pronounced in modern times, with supermarkets, refrigeration, air-conditioning/heating, imported foods, and wider social presence (newspapers, TV, radio, internet, phone) etc.
I suspect this applies especially to language or logic related tasks.
We will likely never find out, variance seems to be extremely high, while the actual differences are very low.