This is a blog post I wrote a few years ago: "A shop, the planets and the days of the week"
In Tokyo there is a shop called Sui Kin Chi Ka Moku Do Ten Mei Kai, written 水金地火木土天冥海. At first glance this seems a very long, hard to pronounce and difficult to remember name, so why name a shop like that? I went to find out and from there got on to the connection between the planets and the days of the week in #Japanese.
https://quickandtastycooking.org.uk/articles/suikin-planets-weekdays/