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Good catch. So 1900 miles is the zero point where time is neither faster nor slower. I had never calculated that.
Originally posted by DenyObfuscation
The question is: which effect wins out — the speed or the gravity effect? Interestingly enough, the two effects cancel if you orbit Earth at a radius of 1.5 times Earth's radius. This is pretty far out: about 1,900 miles (3,100 kilometers) high. If the space station were to orbit this high, an observer on Earth peering through his telescope would see the ISS clock and his clock agreeing.
usatoday30.usatoday.com...
I'm assuming this effect occurs at natural orbital velocity. At GPS sat orbit, adding propulsion to increase velocity may cancel the lowered gravity but I'm not positive about that. That's something I would like to know for certain.
So, someone should really make a better graph than this, showing the 1900 mile zero point, but I've never seen it.
The x axis is radius from centre of earth.
The y axis is proper time added to satellite (second) per earth (equator) second from earth-equator's reference frame.
Green is gravitational time dilation
Blue is velocity time dilation
Red is total time dilation
And Brown is r=earth's radius
Originally posted by Zaphod
Originally posted by yorkshirelad
Originally posted by spy66
reply to post by Biigs
From the edge of a black hole you will start to accelrate towards the center of gravity. Your time slows down as you accelerate. But as you get closer to the center of the black hole you will start to reduce speed. And time will start to move faster again.
Here's a thought. At the very instant a black hole forms time at the centre of the (ex) star is normal whereas time at the surface must, since light stops, be stopped.......hmmm So if time has stopped how can anything move ie collapse. This is the yorkshirelad theory : black holeas are not black holes but black stars. The gradient of time across the "black" star means that as atoms vibrate (ie temperature) some will move into an area of slower time. The net effect is for atoms to drift from the centre of the black star to the surface. Completely the opposite of the current theory. My solution solves the paradox of a singularity as well !
Light doesn't stop, so the rest of your 'theory' falls apart. Light continues to move it just is on a path following bent space that doesn't allow it to ever escape the event horizon.
Originally posted by AfterInfinity
reply to post by Biigs
Why does the Earth's speed affect our aging, and how does going in a larger ellipse help?
further away from the gravitation effect, the speed round the sun, im not sure how much that might help, but it seems mass causing gravity seems to effect matter more than speed, since high speed is so hard to achieve.
Originally posted by AfterInfinity
reply to post by Biigs
further away from the gravitation effect, the speed round the sun, im not sure how much that might help, but it seems mass causing gravity seems to effect matter more than speed, since high speed is so hard to achieve.
Does the sun's gravitational force also affect our molecular cohesion?
Originally posted by yorkshirelad
who is the one that has slower time? The answer is the one who accelerated to the faster speed. So with the above clocks. The one in the plane accelerated.
Couldn't this GPS argument simply be the result of the satellite's distance relative to Earth?
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!
www.astronomy.ohio-state.edu...
Originally posted by swan001
Originally posted by yorkshirelad
who is the one that has slower time? The answer is the one who accelerated to the faster speed. So with the above clocks. The one in the plane accelerated.
..or simply because one is closer (the one on Earth) to Earth's bosonic field, which has energy and influences atomic decay.
You will also age slower on the moon compared to earth, due to its lower gravity while you will age faster on jupiter due to its higher gravity, as higher gravity speeds up time
Yes as you speed up time slows down so you age slower.