Foreign language rule
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Are these representing days of the week or ordinal numbers? These are all cognates in Spanish but I don't see the connection
Week days in Portuguese, start in Sunday goes to Saturday.
So why do you use numbers? Domingo and sábado make sense as they're the same in Spanish
Because catholicism, the roman language names came from pagan gods, and the Portuguese wanted to distance from that. Sunday and Saturday keep their romance name because it had catholic/Jewish religious origin already.