Anthropology

1800 to 1600 BCE, the Nebra Sky Disk.

https://en.wikipedia.org/wiki/Nebra_sky_disc

Yet, stone age people were creating earth mounds and stone monuments that allowed them to keep track of seasons and the sun and moon. They were creating stories about constellations. They must have been not only observing the sky for centuries or millennia to know how to create those earth and stone seasonal tracking devices, but must have also recorded the info in depictions somewhere in order to collect and pass on the information necessary for creating the monuments.

Were sky depictions painted or carved onto perishable surfaces that have not survived? Animal skins, wood, clay?