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Oh, this paragraph somehow escaped my attention 😯 Big thanks for pointing out!

Yeah, thanks, that's pretty much it! Except we cannot really make days of the week get locked to the days of our year because 365 is not divisible by 7, and we're adding 1 day to February every 4th year on top of that.

Ok, I've rephrased the edit section once more

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.

They have a separate repository for the server.

Well, it's still pretty rough because it's in early development stage, but blazingly fast thanks to Rust (and Dart?). And seeing how active development is right now gives good hopes.

Nothing that requires your phone number to register or has centralized backend could be considered privacy-friendly.

Nothing bad will happen if 80% of what is daily posted on Youtube will cease :) Together with fights for viewer's attention, overproduction and creators burnout.

I wonder how anything that requires your phone number can be considered private at all? And why people don't widely use Matrix?..

The real FOSS alternative to Notion is called AppFlowy. And it already has a docker.