Part 2 of Seth’s Wine Cellar, featuring Anne Curtis, senior research scientist, National Physical Laboratory, U.K., on building ever more precise atomic clocks.
(TRT 5:14)
The latest from Seth on Huffington Post:
The World Next DoorIf it’s for real, it’s the closest planet beyond our solar system. The closest planet in outer space. Astronomers using a telescope at the European Southern Observatory in Chile have announced the discovery of a world... (read more)
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{ 1 comment… read it below or add one }
Hi There.
I enjoyed Anne Curtis and her explanation precision timekeeping and GPS systems.
Question: What reference point(s) on the ground does the GPS use to determine which street/highway/interstate that I am on. For example, I frequently pass under an overpass or drive parallel to an interstate. Sometimes my GPS will recalculate and tell me to turn when there is no place to turn. This happens frequently when I am driving parallel and very close to an interstate highway on a service or access road.