On the moon's surface, there is a passenger car. It's roof is made of glass. From just above, light waves (plane waves) of a star are entering this roof horizontally. These plane waves reach floor horizontally also (it must be so geometrically). If Einstein's "right triangle" is right, when the passenger car moves, number of waves that stay between the roof and floor may increase. And it may be the same to an observer who is in the passenger car (it's irrational. speed of light ray in the moving car is appearance).

[P.S.] The speed of wave front (horizontal) in above passenger car (moving) may be visible to be the same to an observer who stands on the moon's surface.

In the outer space, a mirror is reflecting a light ray. The angle of incident light and reflected light may not be the same generally. Because speed of incident light is variable.