To first approximation, gravitational redshift is proportional to the difference in gravitational potential divided by the speed of light squared, , thus resulting in a very small effect. Light escaping from the surface of the Sun was predicted by Einstein in 1911 to be redshifted by roughly 2 ppm or 2 × 10−6. Navigational signals from GPS satellites orbiting at altitude are perceived blueshifted by approximately 0.5 ppb or 5 × 10−10, corresponding to a (negligible) increase of less than 1 Hz in the frequency of a 1.5 GHz GPS radio signal (however, the accompanying gravitational time dilation affecting the atomic clock in the satellite is crucially important for accurate navigation). On the surface of the Earth the gravitational potential is proportional to height, , and the corresponding redshift is roughly 10−16 (0.1 parts per quadrillion) per meter of change in elevation and/or altitude.
to first approximation gravitational redshift is proportional to the difference in gravitational potential divided by the speed of light squa:red  thus resulting in a very small effect light escaping from the surface of the sun was pre:dicted by einstein in 1911 to be redshifted by roughly 2 ppm or 2 × 10−6 navigational signals from gps satellites orbiting at altitude are perceived blueshifted by approximately 05 ppb or 5 × 10−10 corresponding to a (negligible) increase of less than 1 hz in the frequency of a 15 ghz gps radio signal (however the accompanying gravitational time dilation affecting the atomic clock in the satellite is crucially important for accurate navigation) on the surface of the earth the gravitational potential is proportional to height  and the corresponding redshift is roughly 10−16 (01 parts per quadrillion) per meter of change in elevation and/or altitude