08/16/2009 >> Visit(www)
This is a little app I made that calculates where on the planet an equinox is currently occurring. The pin in the map indicates where the sun is currently at high noon, and would be directly above someone standing at that point (hopefully sometimes on a boat!).
Any point along the horizontal plane there would also experience a day and night of exactly the same length.
The calculations aren't completely perfectly accurate (there are some pretty heavy calculations that can vary over a period of 40k years), but it's pretty close.