In fifteenth-century Europe, heretics are being burned at the stake. Rafal, a brilliant young man, is expected to enter university at an early age and study the era's most important field, theology. But Rafal values Reason above all else, which leads him both to the shocking conclusion that the Earth orbits the Sun, and into the hands of the Inquisition!

A decade later, two members of the Watch Guild, the dour young Oczy and the cynical Gras, find a hidden stone chest that details the secrets of the universe Rafal left behind. Dare they try to change their own stars by selling the heretical texts, or would that only lead to the stake and the fire?

Chi. Chikyuu no Undou ni Tsuite won the Grand Prize at the 26th Tezuka Osamu Cultural Prize awards in 2022. In the same year, it was nominated for the 15th Manga Taisho Award and the 46th Kodansha Manga Awards in the General category. It ranked second in the 2022 Kono Manga ga Sugoi! for the Male Readers Division. In 2023, the manga won Best Comic at the 54th Seiun Awards.

The series was published in English as Orb: On the Movements of the Earth by Seven Seas Entertainment as 2-in-1 omnibus volumes from November 21, 2023 to December 17, 2024. It was also released in Italian by Dynit from January 20, 2023, to March 22, 2024.