Portuguese translation of the English word once in a blue moon

English → Portuguese
  
EnglishPortuguese (translated indirectly)Esperanto
azul
🔗 “Think of the blue sky,” said Mazirian, “the white stars, your castle Miir by the river Derna.”
azul
lua
🔗 The tiny moon is a mere 700 miles wide and appears to be a thick, pockmarked layer of water ice surrounding a smaller rock core.
(on occasion; sometimes; occasionally)
uma vez
(one time)
uma vez

EnglishPortuguese
once in a blue moon uma vez na vida e outra na morte
blue azul
once uma vez