That's just shifting the problem. There is no known way to reliably sync remote clocks except by sending packets and assuming the round-trip time is symmetrical. This is a known problem in physics: https://en.wikipedia.org/wiki/One-way_speed_of_light
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This is the crucial assumption, that to my knowledge hasn't been proven or disproven. Because the alternative, light goes faster in one particular direction, is also perfectly consistent with everything. And if you're moving atomic clocks, correcting for time dilations requires you to make assumptions about the one-way speed of light (which we only know from measuring roundtrip times)