So I'm one of those boring system administrator types who insists that all their servers and other headless devices run in UTC; both Pis are set to Etc/UTC as a timezone and were showing good NTP health, and manual checks showed them synchronised to what I expected. There is a GPS/gpsd on the telescope Pi for location data, which is a little redundant given it's a stationary setup, but it isn't used as a source for system time (e.g. by chrony, as PPS/GPS ref, etc). I'm also in the UK, so in GMT anyway. I also had this issue with local time as BST, a month or so ago.

I will double-check, but I am very confident it isn't this. Good thought though!

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