"The theory has its origins in the biodynamic movement, which Rudolf Steiner, an Austrian philosopher, began in the early 20th century. The ideas are simple, albeit eccentric. Biodynamic wine is created from grapes grown in harmony with nature. This means that the wine is not only organic, but also crafted with a heightened awareness of stars and planets—that is, the forces of cosmic energy. Because such wine growers view the vineyard as a living organism, they presume the grapes are affected by the moon, like other living things. Similarly, consumers should be mindful of when they drink such wine, as the phases of the moon affect the taste of the vintage."
Source :: Big Think