Only when all five are true does the question of which day<\/em> become interesting.<\/p>\n In one line:<\/strong> bottle when specific gravity has been stable for three days, the wine is bright, MLF is settled, CO\u2082 is off, and free SO\u2082 is at target \u2014 then pick a calm, mild day.<\/p>\n<\/blockquote>\n The practice is real, widespread, and old. Its modern form comes from biodynamics, the agricultural system Rudolf Steiner outlined in 1924 and which the German gardener Maria Thun spent decades codifying into a working calendar.<\/p>\n Thun’s system divides the year into fruit, flower, leaf and root days, determined by the Moon’s position against the zodiac. She and her son Matthias published When Wine Tastes Best<\/em>, an annual guide, and the idea took hold in the trade. It is not fringe: the practice reached the point where UK supermarkets including Tesco and Marks & Spencer were reported to be scheduling their press tastings around favourable days, a detail noted in Decanter<\/em> and later in the peer-reviewed literature.<\/p>\n The traditional rules for bottling run roughly as follows:<\/p>\n In January 2017, a team of sensory scientists published a study in PLOS ONE<\/em> titled “Expectation or Sensorial Reality? An Empirical Investigation of the Biodynamic Calendar for Wine Drinkers.” Nineteen New Zealand wine professionals blind-tasted twelve Pinot Noirs, four times each \u2014 twice on a fruit day, twice on<\/p>\n a root day \u2014 rating them across twenty descriptors. The tasters were kept unaware of the study’s purpose; half didn’t know the calendar existed.<\/p>\n The wines were rated differently from one another, as you’d expect. But the type of day made no systematic difference to any characteristic measured. Of the three descriptors that reached even marginal significance, two moved in the wrong direction. The authors concluded there was no support for the idea that a wine’s taste tracks the lunar cycle.<\/p>\n Two things follow from that, and both matter.<\/p>\n First:<\/strong> the study tested tasting<\/em>, not bottling<\/em>. No controlled trial has ever compared wines bottled on a full moon against the same wine bottled a fortnight later. The proposition is, strictly, untested rather than disproven.<\/p>\n Second:<\/strong> the proposed mechanism doesn’t hold up. The Moon raises tides in the ocean because it acts across thousands of kilometres of water. Across 750 ml of wine \u2014 or 4.5 litres in a demijohn \u2014 the differential gravitational force is vanishingly small, orders of magnitude below the forces exerted by simply moving the bottle. Anyone telling you the Moon pulls on your wine “as it does on the tides” is describing a metaphor, not a mechanism.<\/p>\n None of which means the calendar is useless. It is an excellent scheduling discipline. It commits you to a date, it stops you bottling on a whim, and \u2014 because full and waning moons are spread evenly through the year \u2014 it tends to land you on days you’ve planned for rather than days you’ve stumbled into. If foll<\/p>\n owing the Moon makes you bottle carefully, the Moon has earned its keep.<\/p>\n Just don’t let it substit<\/p>\n ute for a hydrometer.<\/p>\n <\/p>\n All dates below are for the United Kingdom (GMT\/BST), calculated for the Greenwich meridian. Exact times shift by minutes across Britain; the dates<\/em> hold.<\/p>\n\n
Moon phases and wine bottling: where the tradition comes from<\/h2>\n
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What the evidence actually shows<\/h3>\n
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<\/h2>\nLunar calendar for wine bottling 2026 (UK dates)<\/h2>\n
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