Bogus astrologer, Ecclitico, is deeply in love with Clarice, but her father, Bonafede, is very protective of his daughters and wants to secure good marriages for them. When Ecclitico learns that Bonafede is particularly interested in astrology, he devises a plan to persuade Bonafede to give him Clarice’s hand in marriage. With the help of his friend Ernesto, who is in love with Bonafede’s oldest daughter Flaminia, and the servant Cecco, who is in love with Bonafede’s maid, Lisetta, Ecclitico makes Bonafede believe that there is a world on the moon.