After the disappearance of Malaysia Airlines flight MH730, Inmarsat tried to use Doppler principle to calculate the whereabouts of the missing flight. The Doppler principle stems from such a physical phenomenon (Doppler effect): as the high speed of the aircraft approaches (or away from) the satellite that receives the microwave signal, the microwave frequency detected by the satellite will become higher and higher (or lower and lower).
Which of the following phenomena reflects the same Doppler effect?
During a solar eclipse, the presence of sunspots was observed