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I've never had any trouble with the time in TheSkyX. It uses the system time. I use a GPS receiver with a 1PPS output along with the NTP software to keep time on my observatory computer. The time does jump around a bit with extreme system activity, but even the worst of that jumpiness appears to be confined to plus or minus a few milliseconds from UTC. Most of the time it appears to be within microseconds. No Internet access required.
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