In the beginning God the father is Alpha, the proton (Hydrogen, H+) which is light. The Holy spirit is omega Oxygen (ΩO2-). These are the elemental spirits of the universe H+ and ΩO2-, Alpha and Omega.
God is Light
Hell is Darkness, Heaven is Light
Creation has a purpose which combines the spiritual goal of separating good from evil with the physics of separating light from darkness. It gives us a unified theory of everything within the broad narrative of scripture.
Where Light Dwells
Night was the darkness that resulted from the creation of light. Now God has gathered up all the darkness into a ball at the center of a spherical creation so night, technically, is inside the earth at this point.
February 12th
In the broad narrative of scripture the separation of light and darkness isn't a cycle from day to night. It's the prevailing theme of the Bible but this separation has to be physical and permanent.