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A comment on Simple streetlight hack could protect astronomy from urban light pollution. Parent comment

Re:Simple streetlight hack could protect astronomy from urba... by quietpain on Saturday November 18, 2023 @12:42PM (#38322137)
In Europe the entire mains grid is synchronised - the smallest deviation in fase & frequency is the same. It’s fairly straightforward to sync them with this distributed reference clock.

Edit: https://www.mainsfrequency.com/

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Re:Simple streetlight hack could protect astronomy from urba... by jcalvinowens on Saturday November 18, 2023 @02:44PM (#38323561)
The frequency observed across all loads in the system might be very consistent, but the phase is absolutely not. Different types of transformers introduce different phase shifts, so this can't work.
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