The Dunhuang map (not the chart studied in the new research) is an early star map from China dating to the Tang Dynasty (A.D. 618 to 907). | Credit: CPA Media Pte Ltd via Alamy The oldest star ...

is now considered the oldest star chart in the world. Later observations written into the catalog showed inconsistencies with Shi’s findings. This was because of Earth’s shift on its axis ...

We have seen a star chart in a watch before. While this is more a star chart than a planetarium, we have no doubt the early planetarium builders would be suitably impressed.