![]() ![]() This paper reviews published confirmations of the ‘Thun effect’ and reanalyses data concerning planting times and crop yields from Spiess's study with radish and carrots, by computing yield values as deviations from a moving average rather than as deviations from seasonal trends estimated by quadratic functions. In 1990, Spiess published a three-year study claiming to find effects of other lunar rhythms but not those of the 27-day sidereal month. ![]() ![]() Thun's philosophy of sowing by this sidereal rhythm has become a major component of biodynamic planting calendars, even though the founder of biodynamic agriculture, Rudolf Steiner, had only mentioned positive effects of the Full Moon in an agricultural context. Root, leaf, flower and fruit crops were found to show increased yields if sown when the Moon stood before Earth, Water, Air and Fire constellations, respectively. These constellations were classified into four groups according to the element (Earth, Water, Air and Fire) astrologically associated with them. In 1956, Thun developed a procedure of sowing according to the position of the Moon in front of the twelve zodiacal constellations.
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