The word of God says:
Genesis 1:16: And God made two great lights; the greater light to rule the day, and the lesser light to rule the night: he made the stars also.
Falsely so called science says:
The moon does not have light. The sun's light is reflected off the moon surface.
So which do creationists believe? Are you really going to "adapt" God's word to aethiest science unscientific explanations? No man has gone past the firmament (they tried to in Genesis and God confounded them).
Genesis 1:16 (stated from man's perspective on earth) (not God's perspective) states in a simplistic manner that the sun was the reason for daylight, and that the moon ruled at night.
During the day the moon cannot be seen. And during the night the sun cannot be seen. That requires a spherical earth.
By observation alone it's known that the moon shines when the sun's rays reach around the sphere to the moon, and reflect the sunlight.. throughout a month the light reflects in phases half, quarter, and full then the new moon (no reflection) begins the new month.
The new moon plays a big part at the time of one of God's appointed dates to celebrate the Feast of Trumpets, the day and hour that no one knows. The sliver light reflecting on the new moon signals the beginning of the Feast. So observation matters a great deal.
When Nimrod was building the tower (of babel), he wasn't trying to go beyond a firmament that wasn't there at that time because all of the water in it had been emptied out in the deluge flood of Noah. The terrarium effect was over. The earth from that time on has weather activity, in seasons.
God lives beyond our solar system, beyond the reaches of the universe.. so Nimrod could not hope to build a tower that reached beyond the atmosphere of the earth to space.
For the people of that era.. the height of heaven was the height of the sky, not any firmament. All mention in verses after Noah's flood uses the word heaven to describe the heights.. not firmament to describe a limit to the heights.
The cultures of that time built their temples on the height of mountains where the clouds formed because they considered the clouds to be where the gods lived. We know from scripture that the principalities of satan have their headquarters at that place where the firmament used to be. Satan is called "the prince of the powers of the air". It is from there that Daniel's angel fought against those demons for 21 days.
Nimrod was only intending to build his tower to the height of the clouds. Somewhere in either Ezek or Isa a verse talks about having a place in the heights of the North. A compass direction on earth. A compass direction because of a spherical earth.
God didn't stop Nimrod from building the tower to keep him from reaching heaven where God resides. That is plain impossible. God stopped Nimrod because of their rebellion, organization and unity by their words in agreement. So God confused their languages so they couldn't agree anymore. Nimrod's kingdom crumbled, his rulership stopped, and God's will of the people scattering across the land was accomplished.
Satan's experiment in Nimrod failed completely.