from your current position and you get the antipodal position, or reciprocal of your location on the other side of the planet. Essentially, it's 180 degrees from your current position, no matter which direction you travel, like the North and South Poles are antipodes.

My antipode, here in South Florida calculates to 27 degrees, 16'516"South latitude, and 99 degrees, 36'58" East.

I'd be out in the Indian Ocean, SW of Australia, about 1,134 miles from the beach in about 14,954 feet of water for my antipodal.

https://maps.google.com/?q=27.281+S,...289063&t=k&z=2
my antipode.gif
Where are you? To calculate this, you simply transpose the latitude from north to south and then subtract 180 from your longitude. It's not as hard as you might think.

Wolfram Alpha has a neat calculator you can use if you don't want to crunch the numbers yourself, but if you've ever wondered what is exactly on the opposite side of the Earth, relative to you, here's your chance.

antipode of current location - Wolfram|Alpha
As you can tell, I'm one of them-thar math geeks.....fellow geeks, let your geek-freak flag fly!