(disclaimer: to not mess up the flow of whatever the fuck im saying im gonna use mock footnotes)
okay so for context heres the days of the week circa grizzly once in discord and then into my google docs:
now, the dominant (1) socio-cultural cosmology in riptide is the aster/lunadeyius(2) polytheism, as seen by both R.A.F.T. and the elders (which represent a major united governing body of a majority of the undersea) following those respective beliefs.
before we continue, let's establish some facts we know about the world of mana and it's history, as well as the metatext:
1. the undersea and oversea were not always split (3)
2. balance is a major theme in riptide
3. there are more cosmologies that are not fully explored in the story at this current time, yet have an influence on the world (4)
that said, let's continue
firstly, i find it interesting that these are the days of the week that the oversea uses (4), which we know to have a primarily aster-leaning bias, yet we only see one direct reference to symbols associated with aster with sunday.
secondly and by contrast, elements associated with lunadeyius are found in moonsday (5) , watersday, and fishday.
i would like to make note that i could see harborsday being a lunadeyius-biased word bc of its association with water, but harbors are land features that are man-made (i.e., a pier or dock) and therefor have that land connection.
twosday is probably a mix between "grizzly is fucking with us" and the more favorable interpretation of "the dominant cosmology is dyadic so pairs/twos are significant"
finally, and probably the coolest for me, is starsday. now, at first, there's an assumption that stars could either be referencing the sun (as the sun is a star) (<- keep this thought in mind!) or the moon (stars come out at night) but i actually think it's an archaic term (for lack of a better word) reflective of the druidic (6) path aurora (7) follows! if that druidic culture is, say, older than the aster/lunadeyius split, it makes sense for it to have some kind of linguistic value that just carries on despite losing some kind of meaning, and interestingly the element of the sun being a star but stars as a whole being associated with night reflects a balance that is thematically relevant to the story!
notes:
1. when i say dominant, i mean dominant power not majority.
2. do not fucking correct me on the spelling of this i dont care
3. see: 110, 116 mainly
4. source: grizzly specified this in discord, and it's also discussed that a traditional language of the undersea is primordial. unclear if this is a thing where the language is only ever used religiously
5. this is just a fun fact but in both english's germanic and latin origins, monday means "day of the moon". also, bc of latin influencing this, "monday" in spanish (lunes), french (lundi), and italian (lunedi) all also come from the latin "dies lunae" (day of the moon) which is from a babylonian tradition of naming days of the week after celestial bodies.
6. part of me thinks this maybe could be similar for malenia and connect to "harborsday" since harbors are a land construct that protects or houses, like the tree.
7. additional evidence for this is the month "auruna" (april) being related to aurora's name linguistically, and it coming from that druidic belief.