Title text:
If you don't know where you are on Earth, the angle of satellite dishes can help constrain your latitude. If some of them are pointing straight up, you're probably near the Equator, right under the ring.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3156/
I know it blew my mind too when I first started building this! It's such a cool project to get to build!