How Angelina Jolie figured out the latitude/longitude of her children's birthplaces?

Angelina Jolie has a tattoo on her arm that shows the latitude/longitude of the birthplace of each of her four children. If you wanted to do something similar, here's how you can figure out the lat/long of any given location, converting it from a common decimal format to the more traditional minutes/seconds value. Jolie's tattoo cracked within too:

Angelina Jolie's latitude/longitude tattoo explained.