Liber Resh vel Helios is a short devotional practice that Aleister Crowley composed in 1911 for practitioners of Thelema. Four times each day, at dawn, at noon, at sunset and at midnight, the practitioner turns to face the sun (or its position below the horizon) and recites a brief adoration addressing it under a succession of Egyptian solar names appropriate to each station of its daily course. The exercise is understood less as worship of the physical sun than as a discipline: a regular act that punctuates the day, keeps the practitioner mindful of the greater cycles in which they stand, and cultivates the attentiveness Crowley regarded as basic to magical training. In this it parallels the fixed daily hours of prayer in older religious traditions, adapted to a modern esoteric framework, and it remains one of the most widely kept of Thelemic practices.
Crowley composed Liber Resh two years after the 1904 reception in Cairo of The Book of the Law, the text he held to be the founding scripture of the Thelemic current, and the practice draws on the earlier ceremonial magic of the Hermetic Order of the Golden Dawn, in which Crowley had trained, adapting its solar and elemental adorations into a simplified daily form. The Ordo Templi Orientis, the fraternal order that became the chief institutional custodian of Crowley's teaching after his death in 1947, made regular performance of Liber Resh an expected discipline for members progressing through its degree system, formalizing what Crowley had originally presented as a personal recommendation into something closer to an organizational requirement.