This is also given in radians.
*m is the geometrized mass of the Earth, m = GM/c²,
**M is the mass of the Earth,
**G is the gravitational constant.

To demonstrate the use of the proper time relationship, several sub-examples involving the Earth will be used here.

For the Earth, , meaning that . When standing on the North Pole, we can assume (meaning that we are neither moving up or down