Bob Johnson writes:
Yes - by measuring the round trip time of the message, and assuming that half of the time was spent in each direction, it is easy to get excellent accuracy. As Bob says, it is the variation in trip time (between the two halves of the trip) that is important - which could be a problem in asymmetric solutions like the ones that use satellite for downstream traffic but modem for upstream - or even, perhaps, DSL.NTP can and does set time more accurately than the propagation time between nodes. What is more important is the variation in propagation time, and NTP attempts to average that out, also.[1] NTP can only possibly 'synchronise' clocks to within the time taken for a message to travel from one system to the other.
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Bill Michell
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