*View: https://youtu.be/ajs8XaDHWHU?t=143*

Scientists were trapped in 1905 when they started to digest a preposterous nonsense: the speed of light relative to the observer is independent of the speed of the observer. Einstein wrestled with his conscience "over a lengthy period of time, to the point of despair" before positing the nonsense:

"But this seems to be nonsense. How can it happen that the speed of light relative to an observer cannot be increased or decreased if that observer moves towards or away from a light beam? Einstein states that he wrestled with this problem over a lengthy period of time, to the point of despair." https://history.aip.org/exhibits/einstein/essay-einstein-relativity.htm

The speed of light relative to the observer obviously VARIES with the speed of the observer. Assume that a light source emits equidistant pulses and an observer starts moving towards the source:

*View: https://youtube.com/watch?v=bg7O4rtlwEE*

The speed of the light pulses relative to the stationary observer is

c = df

where d is the distance between subsequent pulses and f is the frequency at the stationary observer. The speed of the pulses relative to the moving observer is

c'= df' > c

where f' > f is the frequency at the moving observer.