Let me give you a few hypotheses proposed by Heaven and Earth Alliance scholars that suggest the sky is actually the moon,
In "Huainanzi Celestial Writings," it is mentioned that once Gong Gong and Zhuang Xu vied for the throne. After Gong Gong's defeat, he angrily crashed into Mount Buzhou, causing the pillars of heaven to break and the unity of the earth to collapse. This made the sky tilt northwest, and consequently, the sun, moon, and stars moved, with the earth not being full in the southeast, thus waters and dust gathered there.
Before Gong Gong broke Mount Buzhou, this sky was fixed with the help of Mount Buzhou, thus resting above the earth,
Once the sky pillar of Mount Buzhou broke, the moon lost its anchor and began to drift away from the planet, further and further, until human eyes perceived it as a round disk,
And even now, the moon is distancing itself from this planet at a rate of 3 centimeters per year,
