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Worldbuilding

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  • $\begingroup$ The 7 days are associated to the 7 shiny and oddly moving things one can see in the sky: Sun, Moon, Mercury, Mars, Venus, Jupiter, Saturn. I would say they are celestial as well. $\endgroup$
    – L.Dutch ♦
    Commented Apr 1 at 17:34
  • $\begingroup$ @L.Dutch: In Romance languages five of them are, indeed, named for lights in the sky. (Only five because Saturday is "Sabbath Day" and Sunday is "Lord's Day" in Romance.) But in English only three of them are (Saturday, Sunday and Monday) with the other four named for old pagan gods and goddesses, in German only two of them are (Sonntag and Montag), and in Russian none of them are (the Russian week goes "Day after Holy Day", "Second Day", "Mid Week", "Fourth Day", "Fifth Day", "Sabbath Day", "Holy Day"). $\endgroup$
    – AlexP
    Commented Apr 1 at 18:08
  • 2
    $\begingroup$ A tidally locked object rotates once per orbit. That's how the locked object keeps the same face toward the locking object. $\endgroup$
    – JBH
    Commented Apr 1 at 18:39
  • $\begingroup$ "Our use of the seven-day week can be traced back to the astronomically gifted Babylonians and the decree of King Sargon I of Akkad around 2300 BCE. They venerated the number seven, and before telescopes the key celestial bodies numbered seven (the Sun, the Moon and the five planets visible to the naked eye)." (Source) The article also credits the Jewish Genisis account, but it's unlikely a lot of other cultures would have picked that up. The Babylonians, on the other hand... $\endgroup$
    – JBH
    Commented Apr 1 at 18:43
  • $\begingroup$ All that aside, it appears that if you delete everything that's causing us to comment... all of the Earth-centric stuff that isn't relevant to your question at all, what's left is, "can I have a moon the size of Earth's moon that's still rotating more than once per orbit?" I believe it's believed that all moons (celestial objects) rotated and slowly became tidally locked. I believe it's also believed that this takes long enough that life didn't begin until after tidal locking. But is it really necessary to duplicate what happened on Earth? Why not spin the moon and move forward? $\endgroup$
    – JBH
    Commented Apr 1 at 18:50