>>513616182
oh there's been a misunderstanding. my image was supposed to say 27.75 days not 27.5 days. 27.75 days is 666 hours. to find the claim that a lunar orbit around the earth takes 27.75 days, you have to go to older sources like this one from 2004:
https://www.researchgate.net/publication/239926279_Implications_of_lunar_orbital_periodicity_from_the_Chaibasa_tidal_rhythmite_India_of_late_Paleoproterozoic_age