E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
North Side of the Altar (The).
The side on which the Gospel is read. The north is the dark part of the earth, and the Gospel is the light of the world which shineth in darknessilluminare his qui in tenebris et in umbrâ mortis sedent. Facing the altar from the body of the church, the north side is on your left.