I assume your question is based on the rotating Earth?Summary: I have read that depending on your distance from a gravitational source your flow of time is different.
I read that just a few feet difference in height would show a different rate of time and that was measurable. However, If the clock that is at a more elevated position it will be traveling through more space, is that what is responsible for the difference in the rate of time for that clock? I understand that clocks at different heights from the earths gravity field do experience different rates of the flow of time. I wish to know what is the cause of this difference.
On a non-rotating planet, a higher clock (at rest relative to the surface of the planet) would always tick faster than a lower clock, pre-supposing one has the usual synchronization scheme so that we can talk about comparing clock rates at all.
By "at rest", I basically mean having a constant latitude and lognitude relative to the surface of the planet.
On a rotating planet, if we assume that the clock is still at rest relative to the surface of the planet by keeping a constant lattitude and longitude, there may be an additional effect that counters this. This effect goes in the opposite direction if it is present, and may even become large enough to counter the first effect if the altitude is high enough.
The opposing effect will be largest for a clock on the equator, and totally absent for a clock at the poles.
It's possible to be more quantitative, but the original question wasn't phrased very precisely to I think this may be an adequate answer. Assuming I have guessed the question correctly, of course.