But I also need to find out how far around the Earth he is, and how far down. To do that, I’ll use what’s called latitude and longitude.Lines of latitude run around the Earth like imaginary ...

I want to talk about the equatorial coordinate system. Start with this: What if we could project Earth's coordinates of ...

Want to understand why it is that having a precise timepiece (also known as a chronometer) helps you determine your longitude? Play this Shockwave game, get lost on the high seas, and find out.