31. Prior to this analysis, another possible explanation of previous Doppler shift analysis included face-on spectroscopic binaries. 32. If the clocks to not have a velocity relative to each other, then Doppler shift cancels out. 33. Both effects are attributed to a Doppler shift in electromagnetic radiation as it travels across expanding space. 34. In the laboratory frame however, there is a Doppler shift from and an angular deviation from collinearity. 35. GPS units can use measurements of the Doppler shift of the signals received to compute velocity accurately. 36. The Doppler shift of the signals, which provides the location of the aircraft along the BTO-derived arcs. 37. This was done by making precise measurements of the Doppler shift of the spectrum of 14 Herculis. 38. I understand that the Doppler shift would be noticeable, but that is just part of the curiosity. 39. This is necessarily so, since to stay outside a horizon requires acceleration which constantly Doppler shifts the modes. 40. Some weather radars uses doppler shift to measure wind speeds and dual-polarization for identification of types of precipitations.