According to certain set of people who believe in the biodynamic calendar, the position of the moon could have an impact on the taste of your wine.
They claim that wine tastes better when the moon is passing through Sagittarius, Aries, or Leo—a.k.a. “fruit days.” And the wine tastes bitterer when the moon is passing through Virgo, Capricorn, or Taurus—a.k.a. “root days.”
There hasn’t been any scientific proof for such claims so if you want to put the theory to test, you know what to do.