Jason Lisle performed a calculation that, to me, seems possibly to have been a
one-way measurement of the speed of light! The article is at
https://biblicalscienceinstitute.com/ap ... solutions/
The calculation was simple - speed is distance / time, as in miles per
hours; Lisle divide the distance between a supernova and another object
that reflected the supernova's light to earth, by the difference in time
for the arrival of the light on earth from both objects.
It seems to me that this is one-way - light traveled from the supernova,
not to the supernova, and that speed is what Lisle calculated / measured
(using other measurements of distance and time).