GPS, relativity, and nuclear detection
GPS is just a big clock in space! (and it can detect nuclear explosions) Trying out a new feature: English Transcript! Let me know how it works Tweet it - http://bit.ly/ufPyF7 Facebook...
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We take navigation for granted these days - GPS receivers guide airplanes, cars, andeven cell phones!But did you know that the Global Positioning System is basically a big clock in space?There are thirty GPS satellites in orbit, and they just broadcast where they are andwhat time it is.All your phone GPS has to do is receive signals from four satellites and it can triangulateits location in the four dimensions in which we live – three space and one time.But actually it's not that simple! In order for navigation to work, the satellites carryatomic clocks accurate to the nanosecond – otherwise your GPS receiver might tell you you're halfwayacross town when you're still in the driveway.And special relativity tells us that moving clocks run slow, whil...
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We take navigation for granted these days - GPS receivers guide airplanes, cars, andeven cell phones!But did you know that the Global Positioning System is basically a big clock in space?There are thirty GPS satellites in orbit, and they just broadcast where they are andwhat time it is.All your phone GPS has to do is receive signals from four satellites and it can triangulateits location in the four dimensions in which we live – three space and one time.But actually it's not that simple! In order for navigation to work, the satellites carryatomic clocks accurate to the nanosecond – otherwise your GPS receiver might tell you you're halfwayacross town when you're still in the driveway.And special relativity tells us that moving clocks run slow, whil...
