In them he has set a tent for the sun,
which comes out like a bridegroom leaving his chamber,
and, like a strong man, runs its course with joy.
Its rising is from the end of the heavens,
and its circuit to the end of them,
and there is nothing hidden from its heat. Ps 19.4b-6 (ESV)
The Hebrews believed that the sun was the highest creation in the natural world because it was so central to life. If there was no sun, then there would be nothing else. The sun gave heat, the sun brought light and without light the crops would not grow. It followed a daily pattern that was so consistent they could use that pattern and plant their crops at the correct time and reap the benefit of the faithfulness of the sun.
They had no idea, however, how huge the sun really was and what it did. We have the benefit of living in a time when we know much more about the sun and we realize that it is much greater than even the Hebrews imagined. And if the sun is so much greater, than how much even greater! must be the One who created the sun.
Louie Giglio again:
“By the word of the Lord the heavens were made, and by the breath of his mouth all their host.” (Psalm 33:6, ESV)