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I think the question was always, "where was the error made?" Glad they found it.
To explain something from the article, GPS satellites transmit time data as well as location. Normally in a handheld unit the time is thrown out after resolving the unit's position, but researchers will use GPS to get a precise time value for their work (and often they'll throw out the position).
I think the question was always, "where was the error made?" Glad they found it.
To explain something from the article, GPS satellites transmit time data as well as location. Normally in a handheld unit the time is thrown out after resolving the unit's position, but researchers will use GPS to get a precise time value for their work (and often they'll throw out the position).
Are you refering to the uncertianty principle? Is that why they keep one perspective and throw out the other?
Now if we can get scientists to re-examine evolution.
I think the question was always, "where was the error made?" Glad they found it.
To explain something from the article, GPS satellites transmit time data as well as location. Normally in a handheld unit the time is thrown out after resolving the unit's position, but researchers will use GPS to get a precise time value for their work (and often they'll throw out the position).
Are you refering to the uncertianty principle? Is that why they keep one perspective and throw out the other?
No, it is about what is useful information in different applications. If you are trying to go from point a to point b, you care about where you are but not about the time (at least not to the nanosecond precision that GPS gives you). If you are doing a critical experiment requiring precise clock synchronization, you care about time, but, presumably, you already know where you are. (I suppose there might be applications where you'd like to know both your position and your time.)
All four values (three for position and one for time) are required from four different satellites to resolve either your position or your time (or both). I'll explain what I mean in the case of wanting an accurate time value. Say you get a signal from satellite 1 that says it's position is x1,y1,z1 at time t1. That's great, but it doesn't tell you your time because you don't know how far away you are from the satellite. You need to know your position because the signal didn't reach you instantly; it traveled to you at the speed of light. So you get signals from three other satellites to solve for both your position and your time. Then at the end, if you were only interested in getting an accurate time value, you ignore the position information that you resolved.