|Does the Phrase "Evening and Morning" Help Define "Day"?
|Interestingly, the very first time the word is used, in Genesis 1:5, it is strictly defined as the light portion of a light/dark cycle as the earth rotated underneath a directional light source, producing day and night.
|The New Defender's Study Bible
|1:5 Day. The use of “day” (Hebrew yom) in Genesis 1:5 is its first occurrence in Scripture, and here it is specifically defined by God as “the light” in the cyclical succession of light and darkness which has
|Either by the circulating motion of the above body of light, or by the rotation of the chaos on its own axis towards it, in the space of twenty four hours there was a vicissitude of light and darkness