Reprinted with permission from The Globe: How the Earth Became Round by James Hannam, published by Reaktion Books Ltd. Copyright © 2023 by James Hannam. All rights reserved. It was a big job, being emperor of China. He didn’t just have to run the country. The universe itself depended on him. He had a sizeable support staff of bureaucrats and eunuchs, but the buck stopped at the dragon throne. Dong Zhongshu (c. 175–105 BC), an adviser to Emperor Wu (156–87 BC), wanted to ensure his master understood the magnitude of…