(I did a cursory search for a discussion on the forum about the precise calibration of radiation and neutrinos over distance, but could not find such. Admins, please discard this post if it has already been discussed.)
The tantalizing evidence that the velocity of light is preceded by the greater speed of neutrinos is all over the news at the moment.
It would seem that we stand on the cusp of being able to precisely measure the distance of powerful bursts of energy, such as a nova.
I recall a few years ago that a burst of radiation from supernova SN1987A was preceded by a burst of neutrinos three hours before the radiation.
It follows that if we can produce a source of radiation emission such as that created by the OPERA international experiment, then we can calibrate the exact amount of time it takes light and neutrinos to get from point A to point B,
By calculating the time delay between light and neutrinos, we would know with considerable exactness the distance if a given emission.