Again, you show only a surface understanding, while ignoring the deeper meaning. Tell us what you think the light is. It couldn't be the Sun since it was not made until the 4th Day Gen 1:16. What is this light which God called Day and why is it good?
In the future there will be no more sun. The Lord will be the light!
Revelation 22:5
There shall be no night there: They need no lamp nor light of the sun,
for the Lord God gives them light. And they shall reign forever and ever.
He did that in Genesis One. He has that ability, and provided the light for the first three days!
Why the first three days without a sun? The first three days was a type of reenactment of the way days were once manifested in the previous prehistoric creation. That was world where the angels had been given dominion, not Adam. Why can I say that? What Scripture?
Isaiah tells us that Lucifer used to herald in the morning light (Isaiah 14:12). Lucifer was created in the Lord's image, too. But, in a different way than man. Light bearing! The Lord revealed light in the first three days of Genesis. Without Lucifer to begin the morning as before his fall, the Lord provided all the light for the the day. Fallen Lucifer was now being left out of heralding in the mornings. The angels watching this going on were most likely assuming that this world was going to be much like the creation they had reigned in.
Angels bearing light? We can deduct from words found in Job 38, that some did bear light in the prehistoric creation. But, not tremendous light like Lucifer produced who was able to bring in the mornings. These special angels most likely ruled through the night. For, the angels are called
"morning stars" and had a different function from the regular angels.
My guess is that the morning star angels were used to set seasons and to help with the needed migration of the herds on that prehistoric earth. Just like our sun, moon, and stars are said to do in our world's creation.
Job 38:6-7
To what were its foundations fastened?
Or who laid its cornerstone,When the
morning stars sang together, And all
the sons of God shouted for joy?
Two different kinds of angels are mentioned in that passage..
There were two species of angels created by God. Two races of angels. One race was created to be light bearers. The other race, was not light bearing. That is why we see such a name as Lucifer! Lucifer means,
"light-bringing."
https://en.wikipedia.org/wiki/Lucifer
The first three days were like days the angels had always been accustomed to. Then! When God made the sun, moon, and stars to bear light? God was slamming down the arrogance and pride of the fallen angels, who in the previous creation must have felt they had been indispensable. They obviously felt "superior" to the non-light angels. And there was God in Genesis One, replacing these arrogant angels with dead, light bearing rocks floating in space! It must have been a shock to the angels to see that new way to produce lights for day and night.
.