Tony Finch wrote: > The local atomic clocks on the Moon or Mars will not run at the >same rate as a time signal transmitted from the Earth.
More due to being at high altitude than due to relative motion, I believe. If you're concerned about local interval time, with a sufficiently heavy emphasis on "local", TAI or other realisations of TT are inadequate even on the Earth's surface. Though you'd likely get better time by applying a calculated frequency offset to TAI than by running your own (isolated) atomic clock. TT (roughly: interval time on the geoid) ticks 0.9999999993030709866 s (exactly) for each second of TCG (roughly: interval time at infinite altitude). Interval time on the lunar surface, like interval time up a Terran mountain, ticks at some rate between these two. A side effect of gravitational time dilation is that (presuming infinite precision) radio time signals with phase-locked carrier don't actually transmit on precisely their nominal carrier frequency, as judged locally at the transmitter. Being above sea level, they transmit on a fractionally lower frequency. As the signal travels downwards it gets blue-shifted, so that at sea level it appears as precisely the nominal frequency. It's the revenge of the rubber seconds. -zefram _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com http://six.pairlist.net/mailman/listinfo/leapsecs
