Drunk with power...er beer.
Join Date: May 2010
Location: Vancouver, BC, Canada
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The date of summer solstice varies from year to year (as does winter solstice and both equinoxen) because the year isn't exactly 365 days long. It can also vary on any particular instance based on what side of the date line you're on, but expressed in GMT it happens at one particular second worldwide.
Coffee is your friend. Everyone else is an acquaintance.