Oh..thought you meant Jon Lovitz!!
Posted on 08/18/2015 10:43:22 AM PDT by PJ-Comix
Time travel is one of the elements of science fiction writing. However, in the case of former Obama speechwriter Jon Lovett writing in The Atlantic it is more in the realm of science fantasy, emphasis on fantasy. Lovett's time travel to the near future of President Donald Trump tells us much less about Trump than it does about extreme liberal fantasies. As a bonus, Lovett's essay veers from science fantasy to extreme comedy but first let us watch him mock a future Donald Trump that exists only in his fervid liberal imagination:
(Excerpt) Read more at newsbusters.org ...
He’ll be able to pare down DT’s speeches substantially since the Donald doesn’t prefer to litter his utterances with guttural pauses, groans, “ahhs” and “uhhs.” They’ll be brief, to the point and sound as if they are delivered by an adult rather than by an unprepared college freshman.
Most Americans see one thing in a future Trump administration:
Employment.
“Time travel is one of the elements of science fiction writing.”
Most people I’m sure don’t know that time travel, of the forward variety, is happening all the time. Einstein’s theory simply put: moving clocks tick out time more slowly than those considered stationary. In other words, time for a person passing by you in an automobile is ticking more slowly for them than for you. Therefore, they will have experienced less aging than you in that particular time interval. A second for one person is not the same for another, if they are in a state of relative motion that is.
Oh..thought you meant Jon Lovitz!!
I posted a reply to you next week.
Thanks, I got it yesterday.
Real men don’t need a teleprompter crutch to express himself.
With time dilation.. time should move more slowly at the equator then.at the poles of the earth... and given that there is that differential between the equator and the poles there should be an energy flow between poles and the equator...
With time dilation.. time should move more slowly at the equator then.at the poles of the earth... and given that there is that differential between the equator and the poles there should be an energy flow between poles and the equator...
If you mean because someone at the equator is traveling faster than one at either pole, because their path/distance over a 24-hr time period is longer, that is correct, but hardly noticeable. In order for time dilation/length contraction/and mass increase effects to be important, speeds must be a significant fraction of light speed.
However, there is another means for time dilation, length contraction, and mass increase effects to occur: Gravity.
In short, the stronger the gravitational field, the greater the effects. GPS uses BOTH effects in its calculations in order to achieve such high degrees of accuracy. Interestingly, the greater of the effects is actually gravity, which of course is strongest nearer the surface than at high altitudes, as opposed to the high rate of speed of the GPS satellites, which has lesser time dilation, length contraction, and mass increase effects.
So, someone at the equator, due to the *outward* push of centrifugal force due to the rotation of the Earth, weighs LESS than someone of the same mass NOT on the equator. And so therefore has LESS time dilation, length contraction, and mass increase effects on them there than somewhere off the equator.
Things to consider with GPS satellites vs locations on the surface:
1) the high rate of speed of the satellites, vs stationary points on Earth
2) the stronger gravitational force at the surface vs that at the high altitude of the satellites.
In short, the satellites are experiencing time dilation, length contraction, and mass increase effects due to their high rate of speed, while the stationary positions at the Earth’s surface experiences effects due to the stronger gravitational force there. All in all, the gravity effects win out and are more important in the net calculations..
Yes i am referring to that difference and while minor.. the effect should be there...
Give rise to and interesting consent ive played with that time over an point of a given moving 3d object is different at any given point...I see time as similar to aerodynamic drag across the surface of an aircraft each point has different pressures... and adds the concepts you can “push off” time just like a wing can give lift in air from the pressure differential across its surface and a propeller can provide thrust from that same effect
Yes, it is there. But it's outweighed by the effects due to stronger gravity at the surface. ie, the clocks on Earth, although stationary with respect to the fast moving GPS satellites, actually tick more slowly than their high speed counterparts because of the stronger gravitational field they are in (at the surface). However, all effects are taken into account before the net effect is determined.
People often ask me “What good is Relativity?” It is a commonplace to think of Relativity as an abstract and highly arcane mathematical theory that has no consequences for everyday life. This is in fact far from the truth.
Consider for a moment that when you are riding in a commercial airliner, the pilot and crew are navigating to your destination with the aid of the Global Positioning System (GPS). Further, many luxury cars now come with built-in navigation systems that include GPS receivers with digital maps, and you can purchase hand-held GPS navigation units that will give you your position on the Earth (latitude, longitude, and altitude) to an accuracy of 5 to 10 meters that weigh only a few ounces and cost around $100.
GPS was developed by the United States Department of Defense to provide a satellite-based navigation system for the U.S. military. It was later put under joint DoD and Department of Transportation control to provide for both military and civilian navigation uses.
The current GPS configuration consists of a network of 24 satellites in high orbits around the Earth. Each satellite in the GPS constellation orbits at an altitude of about 20,000 km from the ground, and has an orbital speed of about 14,000 km/hour (the orbital period is roughly 12 hours - contrary to popular belief, GPS satellites are not in geosynchronous or geostationary orbits).
The satellite orbits are distributed so that at least 4 satellites are always visible from any point on the Earth at any given instant (with up to 12 visible at one time). Each satellite carries with it an atomic clock that “ticks” with an accuracy of 1 nanosecond (1 billionth of a second). A GPS receiver in an airplane determines its current position and heading by comparing the time signals it receives from a number of the GPS satellites (usually 6 to 12) and trilaterating on the known positions of each satellite[1].
The precision achieved is remarkable: even a simple hand-held GPS receiver can determine your absolute position on the surface of the Earth to within 5 to 10 meters in only a few seconds (with differential techiques that compare two nearby receivers, precisions of order centimeters or millimeters in relative position are often obtained in under an hour or so). A GPS receiver in a car can give accurate readings of position, speed, and heading in real-time!
To achieve this level of precision, the clock ticks from the GPS satellites must be known to an accuracy of 20-30 nanoseconds. However, because the satellites are constantly moving relative to observers on the Earth, effects predicted by the Special and General theories of Relativity must be taken into account to achieve the desired 20-30 nanosecond accuracy.
Because an observer on the ground sees the satellites in motion relative to them, Special Relativity predicts that we should see their clocks ticking more slowly (see the Special Relativity lecture). Special Relativity predicts that the on-board atomic clocks on the satellites should fall behind clocks on the ground by about 7 microseconds per day because of the slower ticking rate due to the time dilation effect of their relative motion.
Further, the satellites are in orbits high above the Earth, where the curvature of spacetime due to the Earth’s mass is less than it is at the Earth’s surface [ie, less GRAVITY-etl]. A prediction of General Relativity is that clocks closer to a massive object will seem to tick more slowly than those located further away (see the Black Holes lecture). As such, when viewed from the surface of the Earth, the clocks on the satellites appear to be ticking faster than identical clocks on the ground. A calculation using General Relativity predicts that the clocks in each GPS satellite should get ahead of ground-based clocks by 45 microseconds per day.
The combination of these two relativitic effects means that the clocks on-board each satellite should tick faster than identical clocks on the ground by about 38 microseconds per day (45-7=38)! This sounds small, but the high-precision required of the GPS system requires nanosecond accuracy, and 38 microseconds is 38,000 nanoseconds.
If these effects were not properly taken into account, a navigational fix based on the GPS constellation would be false after only 2 minutes, and errors in global positions would continue to accumulate at a rate of about 10 kilometers each day! The whole system would be utterly worthless for navigation in a very short time. This kind of accumulated error is akin to measuring my location while standing on my front porch in Columbus, Ohio one day, and then making the same measurement a week later and having my GPS receiver tell me that my porch and I are currently about 5000 meters in the air somewhere over Detroit.
The engineers who designed the GPS system included these relativistic effects when they designed and deployed the system. For example, to counteract the General Relativistic effect once on orbit, they slowed down the ticking frequency of the atomic clocks before they were launched so that once they were in their proper orbit stations their clocks would appear to tick at the correct rate as compared to the reference atomic clocks at the GPS ground stations. Further, each GPS receiver has built into it a microcomputer that (among other things) performs the necessary relativistic calculations when determining the user’s location.
Relativity is not just some abstract mathematical theory: understanding it is absolutely essential for our global navigation system to work properly!
http://www.astronomy.ohio-state.edu/~pogge/Ast162/Unit5/gps.html
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