From Inter: etyl » ga Inter: term » deiseal|lang=ga, from Inter: etyl » sga Inter: term » dessel|lang=sga, from Inter: etyl » sga Inter: term » dess||right, south|lang=sga + Inter: term » sel||turn.
In the eyes of our early forefathers the daily course of the Sun, bringing about the alternation of light and darkness and the regular succession of the seasons, was the most striking example that man had of that divine order of the universe which served as a model for order and justice in terrestrial affairs. Hence to go dessel or righthandwise, thus imitiating the course of the sun, was not only the right way to make a journey, but was likewise beneficial in other affairs of life, and was likely to lead to a prosperous result; whereas to go in the contrary direction (tuaithbel) would be a violation of the established order and would lead to harm. — T. F. O'Rahilly, Early Irish History and Mythology, Dublin (1946), pp. 296-297.