Maths problem for a theoretical method of travelling time.

[Time Machine]

I am trying to portray a method of time travel on another thread. I have no maths. It's NOT helping. I was wondering if anyone would care to venture into the project?

My idea is as such:
Based on the fact that time is variable to gravity. (See link)
I suggest that should gravity be controllable, (unlikely I know,) that based on Einstein's twin paradox:
If a spacecraft could maintain the same gravity as that on Earth during it's journey, that the twins would remain the same age.

Dr. Chou at NIST-F1 atomic clock, Colorado states:
For every foot above ground, some one ages by 90 billionths of a second per 79 years.
I see that there is the possibility of working this out into a graph (?) that would portray how much faster time happens per 100 000 ft.
Taking the craft on a journey one could then work out how much faster time is happening the further one is away.

http://www.independent.co.uk/news/s...-bad-news-if-you-own-a-penthouse-2088195.html

 

[CRGreathouse]

It's about speed, not distance. You can use this to (in some sense) travel into the future, but not into the past. Method: You get on a spaceship that travels near to the speed of light. You measure the passage of a small amount of time while the stationary frame measures a large amount of time.

For example, if you traveled at 99.5% of the speed of light on a journey that lasted 10 years, the stationary frame would experience 100 years in the same time. To shorten the journey to 1 year you would need to go at 99.995% of the speed of light.

 

[Time Machine]

It's about speed, not distance. You can use this to (in some sense) travel into the future, but not into the past. Method: You get on a spaceship that travels near to the speed of light. You measure the passage of a small amount of time while the stationary frame measures a large amount of time.

For example, if you traveled at 99.5% of the speed of light on a journey that lasted 10 years, the stationary frame would experience 100 years in the same time. To shorten the journey to 1 year you would need to go at 99.995% of the speed of light.

I understand that speed and distance are parameters in the calculation but first I need to establish an approximation of the increase that time experiences the further it gets from a gravity well.

I have included the link that I have been portraying this theoretical method of time travel in. I would try to post it over but my understanding of the page parameters is poor, as the other participants of the thread can attest to. I'm afraid they think me quite mad over there. I personally think it's an idea worth consideration but I fear that only a mathematical portrayal will make them understand.
The best I can explain is that my post is at the bottom of page 8 which for me can be found at the top and the bottom of the page in the page counter. I understand that posts have numbers, I just have not found them, yet.

https://www.physicsforums.com/showthread.php?t=441627

 

[Time Machine]

Based on Dr Chou's figures, time is going 5.4 days, per "Earth" day faster, 1 light year distance from Earth, when not near another gravity well.
Is this correct?
Can any-one tell me exactly by how much, does speed slow time down?

 

[willem2]

Based on Dr Chou's figures, time is going 5.4 days, per "Earth" day faster, 1 light year distance from Earth, when not near another gravity well.
Is this correct?
Can any-one tell me exactly by how much, does speed slow time down?

Unfortunately, that 90 nanosecond/79 year is only valid near the surface of the earth. Gravity gets weaker if you get further away from the earth, and the maximum
effect is 90 ns/79 year * (radius of the earth) = 7 milliseconds a year, no matter how far you go away.