Big thanks for detailed answer! My understanding is more clear now.

Looks bad enough. But what’s TPM role in this?

Maybe bcause you use a cloudflare DNS? xD there are mirrors tho: https://git.kescher.at/dCF/deCloudflare/src/branch/master/readme/en.md

Just installed what popped up first in F-Droid search (Jerboa) and not feeling like I need something else - everything just works and UI/UX feels natural.

But the 7 days comes from the amount of time it takes to go from one visible lunar phase to another

I’m not arguing with that, but my question is different: where in history is the exact reference point (day) of today’s weekday countdown? From when have people decided to stop adding or subtracting adjustment days and kept counting till today? The might have been some shifts along the way, but there should be a point exactly N x 7 days ago from which the 7-day countdown has not been interrupted. Or at least the earliest known day in history that everyone on Earth agreed upon as a reference point.

Here is the problem, because actual lunar cycle is 29.5 days long, so if we simply count its phases with whole 7 days it will quickly run out of sync. Therefore Babylonians and other ancient folks added a couple of ‘out-of-week’ days every now an then to compensate the difference.

Well, the question is not about the origin and sequence of weekday names, but about the first day in history of uninterrupted count of 7-day cycles which leads to today’s state of the week. Added this to the post.