  A method to synchronise, at the sub-nanosecond level, clocks used for
neutrino time-of-flight measurements is proposed. Clocks situated near the
neutrino source and target are compared with a moveable clock that is
transported between them. The general-relativistic theory of the procedure was
tested and verified in an experiment performed by Hafele and Keating in 1972.
It is suggested that use of such a synchronisation method may contribute to a
precise test of the Sagnac effect ---a measured velocity greater than $c$---
for neutrinos of the proposed LBNE beam between Fermilab and the Homestake
mine.
