It’s a mysterious thing, the moon. Some people say full moons hinder how they sleep, others fear supermoons will turn them mad, and for a select few amongst us, the moon even has the power to turn us into wolves for the night.

But there are certain people who believe the moon holds a particularly precise power: that is, the ability to affect how wine tastes.

It’s all to do with the biodynamic calendar, you see, which was originally used for growing crops and so is divided into fruit days, flower days, leaf days, and root days.

People who follow the calendar - so-called ‘biodynamic believers’ - claim wine tastes best on fruit days, when the moon is passing through Sagittarius, Leo or Aries.

On root days - when the moon is in Virgo, Capricorn, or Taurus - your 6pm Sauvignon will apparently taste more bitter, and on flower days your Monday Merlot will be more pleasant than on leaf days.

Got it?

You’re probably now wondering how on earth you're supposed to know where the moon is, what stage of the biodynamic calendar you’re at and whether tonight is a good night to crack open that bottle of rosé you’ve had in the fridge for weeks.

But fear not. There is, of course, an app to solve all your troubles.

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Based on 50 years of research by German ‘biodynamic expert’ Maria Thun, who died in 2012, the When Wine Tastes Best app informs users, well, when wine will supposedly taste best based on the biodynamic calendar.

It’ll tell you when it’s a fruit or flower day (hoorah!) and when it’s a leaf or root day (G&T, anyone?).

Despite the fact that a group of Australian researchers recently disproved the theory and found the lunar cycle had absolutely no effect on the taste of wine, the app claims “top UK grocery chains use this calendar to choose their critics wine tastings days.”

Biodynamic farms are increasingly springing up across the UK, which are supposedly seen as whole living organisms that are a part of the planet and the cosmos, as well as being completely organic.