How to Know Where You Are

Six parts, one question. Half of your address is free and the other half took four hundred years to buy — and the answer is sitting in your pocket right now.

1. Part 1Half of Your Address Is Free
2. Part 2Longitude Is a Time, Not a Distance
3. Part 3The Clock That Had to Survive a Ship
4. Part 4The Moon Is the Only Hand on the Sky
5. Part 5Measure One Line, Then Never Measure Again
6. Part 6Your Phone Does Not Know What Time It Is