LF: phase shift compensation question

[Jacek Lipkowski <sq5bpf@lipkowski.org>]

would it be possible to use the phase shift from a strong VLF signal to 
compensate the phase shift for an amateur VLF transmitter? for longer 
transmissions (when the ionosphere height changes etc) over big distances 
etc
could also work for LF, like receiving DCF39 (which is probably very 
stable, even if it's not intended for timing) on 139kHz in Australia to 
measure the phase shift of the path from Germany, so that we can 
compensate the changing phase shift of an amateur transmission on 137kHz, 
so that we could use a long transmission time in ebnaut.
would that work? and would it be worth it?

VY 73

Jacek / SQ5BPF