The latitude and longitude of the center of this map is printed below it. If you're good at finding yourself on a map, you can drag it around, zoom, maybe switch to satellite view, drag some more... until you're centered. (Yes, you can drag it across oceans.)
Hint: Double-click your location, and it will auto-center.
Look below the map, and that's your latitude and longitude.

For those who aren't so good at maps, there are sites (known as geocoders) where you can simply input your address, and get your latitude and longitude:

Here's one for the USA,

one for pretty much the rest of the world,

and a google search for others.