The correspondences attached to Kether in modern Western esotericism belong to a later and distinct layer from the Jewish sources. In the system of the Hermetic Order of the Golden Dawn, founded in 1888, and codified in Aleister Crowley's Liber 777, each sephirah was cross-referenced to planets, colours, gods, plants, stones and tarot cards, building a single grand table of correspondences for magical use. Kether, standing above the planetary spheres, is assigned not a planet but the Primum Mobile, the first swirlings or first motion of the heavens; its colour is brilliant white, and it corresponds to the four Aces of the tarot, the roots of the elements.
Some twentieth-century writers extended the scheme by assigning the outer planet Neptune or Pluto to the supernal sefirot, an overlay later still. It is essential to keep these layers apart: the sefirah Kether and its divine name Eheieh come from Jewish Kabbalah, whereas the elaborate correspondence tables are Hermetic Qabalah of 1888 and after, a Western magical adaptation distinct from the living Jewish mystical tradition it drew upon.