The Bells You Can't Hear
How a phone works out where it is by listening to the sky
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Wren: 26 min · Hollis: 28 min
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Lighthouses in the sky
satellite, orbit
This is where I am
signal, atomic clock, receiver
Counting after the bell
time of flight, distance
Where the circles meet
trilateration, the fourth satellite, relativity correction
Goodnight, old Tock
the wind-down