The Book of Going Back by Night consists of three chapters of transmissions from the Egypto-Thelemic God/dess Hrumachis, the SphinX-form of Horus who presides over the Double Horizon. As a deity of dusk and dawn, S/He also relates to the twilight of the year- the equinox/equilux -and of the Aeons- the 'Equinox of the Gods' where the double-current of Horus and Maat intersect.