the Deity if you notice has the word day in it because our day consist of two opposite polarities of night and day
deus (n.) "God, a god," see
Zeus; c. 1300 as a French interjection; never nativized, but appearing in adopted Latin expressions such as deus absconditus "hidden god."
etymonline.com
supreme god of the ancient Greeks and master of the others, 1706, from Greek, from PIE *dewos- "god" (cognates: Latin deus "god," Old Persian daiva- "demon, evil god," Old Church Slavonic deivai, Sanskrit deva-), from root *dyeu- "to gleam, to shine;" also the root of words for "sky" and "day" (see
diurnal). The god-sense is originally "shining," but "whether as originally sun-god or as lightener" is not now clear.
you see the deus or the zeus is the God of the sky, and the deus or the deuce is the 2
deuce (n.) late 15c., "the 2 in dice or cards," also "a roll of 2 in dice" (1510s), from Middle French deus (Modern French deux), from Latin duos (nominative duo) "two"
and that's why the playing card are cut or DIE as in diagonal which is cut just like the annuel year between spring and autumn
thus the Bi cycle of the days or deity and the annuel year.