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InnerScientist , 18 days ago And further down: Unfortunately, if the one-way speed of light is anisotropic, the correct time dilation factor becomes {\displaystyle {\mathcal {T}}={\frac {1}{\gamma (1-\kappa v/c)}}}, with the anisotropy parameter κ between -1 and +1.[17] This introduces a new linear term, {\displaystyle \lim _{\beta \to 0}{\mathcal {T}}=1+\kappa \beta +O(\beta ^{2})} (here {\displaystyle \beta =v/c}), meaning time dilation can no longer be ignored at small velocities, and slow clock-transport will fail to detect this anisotropy. Thus it is equivalent to Einstein synchronization.
And further down:
Unfortunately, if the one-way speed of light is anisotropic, the correct time dilation factor becomes {\displaystyle {\mathcal {T}}={\frac {1}{\gamma (1-\kappa v/c)}}}, with the anisotropy parameter κ between -1 and +1.[17] This introduces a new linear term, {\displaystyle \lim _{\beta \to 0}{\mathcal {T}}=1+\kappa \beta +O(\beta ^{2})} (here {\displaystyle \beta =v/c}), meaning time dilation can no longer be ignored at small velocities, and slow clock-transport will fail to detect this anisotropy. Thus it is equivalent to Einstein synchronization.