Passage: In 1892, Hendrik Lorentz proposed a modification of Fresnel's model, in which the aether is completely stationary. He succeeded in deriving Fresnel's dragging coefficient as the result of an interaction between the moving water with an undragged aether. He also discovered that the transition from one to another reference frame could be simplified by using an auxiliary time variable which he called local time:

Question: What was another name of auxiliary time?
local time