N
a small displacement towards the red in the spectra, caused by the interaction between the radiation and the gravitational field of a massive body, such as the sun 爱因斯坦位移
[astronomy]
Einstein's equations first written down in 1905 and 1915 are used to correct for this time-shift, allowing GPS to work, planes to navigate safely and you to get to your relations' house at the other end of the country without getting lost this Christmas.