Wikipedia does the math for us here. https://en.wikipedia.org/wiki/One-way_speed_of_light#Slow_clock-transport https://en.wikipedia.org/wiki/One-way_speed_of_li

Wikipedia does the math for us here. https://en.wikipedia.org/wiki/One-way_speed_of_light#Slow_clock-transport https://en.wikipedia.org/wiki/One-way_speed_of_light#Slow_cl.... The TLDR is that the standard lorentz transform assumes the 1 way speed of light doesn't vary, so to do the math correctly you need generalized lorentz transformations https://en.wikipedia.org/wiki/One-way_speed_of_light#Generalizations_of_Lorentz_transformations_with_anisotropic_one-way_speeds https://en.wikipedia.org/wiki/One-way_speed_of_light#General...