Steiner's future event, around the eighth millennium, when the moon rejoins the earth, physical birth ceases, and humanity must master moon-forces consciously or fall to mechanization.
The Reunion of Moon and Earth in Anthroposophy is the future cosmic event, placed by Rudolf Steiner in the eighth millennium, when the moon that long ago separated from the earth re-unites with it. Steiner described it in Materialism and the Task of Anthroposophy (GA 204, 1921). At that point human physical reproduction ceases, and humanity must take in the returning moon-forces with a spiritually enlivened intellect. Those who do unite with the higher beings descending since the 1840s; those who keep only shadow-thoughts are absorbed into an ahrimanic, automaton-like brood. The event mirrors the primeval departure of the moon that once made independent earthly birth, and human freedom, possible at all.
In Steiner's Own Words
At the time of Christ's death, when the event of Golgotha took place, people were generally capable of physical and spiritual development until the age of thirty-three. Today, they are only capable of this until the age of twenty-seven. And a time will come in the fourth millennium when people will only be capable of development until the age of twenty-one. Then a time will come in the 7th millennium when people will only be capable of development through their physicality until the age of fourteen. Women will then cease to be fertile; a completely different way of life on earth will begin. It will be the time when the moon approaches the earth again and reintegrates itself into the earth.
What it Means Today
Of all Steiner's pictures of the deep future, the reunion of moon and earth is the one that reads most uncomfortably like a warning about machine intelligence. In the same lecture cycle, gathered in English as Materialism and the Task of Anthroposophy (GA 204), published by SteinerBooks in Great Barrington, Massachusetts, Steiner says that a humanity that thinks only "shadow-thoughts" about the mineral world will see those thoughts harden, when the moon returns, into a covering web of intelligent but loveless spider-beings. The image is not decoration. It is his clearest statement that abstract intellect, cut off from the heart, becomes ahrimanic substance.
The lineage that carried this teaching forward is the School of Spiritual Science at the Goetheanum in Dornach, Switzerland, the institution Steiner founded in 1923 to keep his esoteric research in living practice rather than fixed dogma. Anthroposophist Sergei O. Prokofieff (1954 to 2014), a member of its Executive Council, treated the moon-sphere and these "sub-natural" forces at length, reading Steiner's spider-prophecy as a description of electricity, mechanization, and a coldly clever technology that imitates life without possessing it. Thalira-synthesis: the reunion is therefore best read not as a date to fear but as a measure, the question of whether a civilization can keep feeling and willing inside its thinking, so that when the moon-forces return they meet a heart and not a calculating machine.
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