"1.
The speed of Light quantum is constant: c=1,
no matter how the source or the observer moves.
/ Michelson’s experiment. 1881. SRT. 1905. /
2.
But .. .. in every book and textbook is written that
there isn’t absolute speed. For example in the book
“ Relative theory- actual” by Prof. Ernst Schmutzer.
Part 3.2.2.page 122. and
Part 3.2.4. page 130." - socrat