Why is the moon compared to green cheese?

To say a person believes the moon is made of green cheese is to ridicule his credulity, it being presumed that such a person would believe the most absurd thing imaginable. In this connection, green is used in the sense of fresh or unseasoned. A green cheese is a new cheese. Such a cheese is supposed to resemble the moon in shape, size and color. This homely comparison is very old and probably originated with the country people of England. Sir Thomas More (1478-1535) wrote: “He should, as he list, be able to prove the moon made of green cheese.” That the expression was proverbial even at this early date is indicated by the fact that John Heywood (14977-1580?), the English dramatistand epigrammatist, infers that people who “think that the moon is made of a green cheese” are dolts and fools. Frangois Rabelais (1490?-1553), the French satirist, is often quoted as having first made the comparison, but it appears only in the English translation of his work.