The first region the soul enters after death, bounded by the Moon's orbit, where every earthly passion is inscribed as a lasting record.
The Moon Sphere in Anthroposophy is the first planetary region the soul inhabits after death, the realm bounded by the orbit of the Moon that Rudolf Steiner equates with kamaloka. Described in Occult Investigation into Life between Death and Rebirth (GA 140, 1913), it is the zone where the expanded soul still clings to its earthly longings and gradually relinquishes them. Its defining lunar quality is recording: every emotion, passion, and unfulfilled resolution from the just-finished life is inscribed here, the cosmic ledger of moral debt that the soul reads back before passing onward to the Mercury sphere. Bodily desires fall away here because they can no longer be satisfied. The Moon Sphere is therefore both a weaning-place and an akashic tablet on which one's own imperfections stand permanently written.
In Steiner's Own Words
When the kamaloca phase draws to a close, man leaves behind him as if removed everything that during his physical existence was the expression of his propensities, longings and desires for earthly life. Man must experience all this but he must also relinquish it in the Moon sphere or kamaloca. As man lives on after death, and later recalls the experiences in the Moon sphere, he will find all his earthly emotions and passions inscribed there, that is, everything that developed in his soul life as a result of his positive attraction to the bodily nature. This is left behind in the Moon sphere and there it remains. It cannot be erased so easily. We carry it with us as an impulse but it remains inscribed in the Moon sphere. The account of the debts, as it were, owing by every person is recorded in the Moon sphere.
What it Means Today
Steiner gave these descriptions to small anthroposophical audiences in 1912 and 1913, and the lineage that carries the Moon-sphere teaching today is esoteric Christianity as taught at the Goetheanum's School of Spiritual Science in Dornach, where the after-death "research" Steiner claimed is treated as a path of disciplined inner observation rather than received doctrine. The lunar ledger of debts has a precise practical use in that tradition: it is the reason anthroposophists practise an evening review, running the day backwards before sleep. The premise is that what the soul will read in the Moon sphere is already being written each night, so the rückschau, the backward review, rehearses in miniature the recording the Moon performs at large.
Read this way, the Moon sphere reframes a familiar modern intuition. We tend to imagine memory as fading, the past growing dim. Steiner inverts it: nothing of the inner life is lost, least of all the unfulfilled intention, the promise to oneself never kept, the talent left unworked. The Goetheanum synthesis Thalira draws from names this the Lunar Tablet, the cosmos keeping faithful account where earthly conscience grows forgetful. The point is not dread. Steiner insists the inscription can be of the greatest value, because reading one's own arrears is how the next life's tasks are set. The Moon is the threshold-keeper of kamaloka: cross it, and the longing for the body is finally spent.
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