Big day today. I'd taken the day off yesterday to setup my NAS, which actually only took a couple of hours but then I began to tinker… Anyway, today I reformatted the clock's SD card and reinstalled Raspbian. Then I went through the process of setting up the clock, making sure that everything I hadn't documented before got documented.

That done, I turned my attention back to the thorny problem of when sunrise occurs. My calculations are close, but I'm not happy with them. I'll lick it soon