Pinned down over the discovery of Neptune using globular maths to predict its presence and location, I managed to show that Neptune didn't exist using the days of the week.
French Spanish Englishlundi lunes moon day (lunar) Monday
mardi marets mars day Tuesday (Tiu's day - Norse equivalent)
mercredi miércoles mercury day Wednesday (Woden day - Norse equivalent)
jeudi jueves jupiter day Thursday (Thor's Day - Norse equivalent)
vendredi viernes venus day Friday (Fria day - Norse equivalent)
samedi sábado saturn day Saturday
dimanche domingo sun day Sunday
https://www.crowl.org/Lawrence/time/days.htmlThere is no Uranus or Neptune day. Those gods exist but they aren't venerated with a day because those planets don't exist. Otherwise we'd have 9 days in a week.
I'm wondering if we shouldn't just compile a best selling joke book compiling all the best flat earth proofs.