I was wondering how in the creation week account we could have ‘evening and morning’ before the sun had been created on the 4th day?
Good question. Snd the answer can be found in the Hebrew words for light. In Genesis 1:3 the word is our also spelled owr. It means light. God “turned on” the light to separate it from the darkness. The fact that He called the light day and the darkness night indicates that both were present, but not at the same time.
In Genesis 1:14 the word for light is ma’our or ma’owr. It means light repository, literally candlestick or chandelier. This indicates that God gathered the light into two specific sources, one for the day and one for the night, to mark days, years, and seasons as well as to light the earth.
Note: for more on this, see Jack’s article, Let There Be Light