The Xiaotang Mountain Han Shrine (Chinese: ; pinyin: Xiàotáng Shan Hàn Mù Cí) also known as the Guo Family Ancestral Hall (Chinese: ; pinyin: Xiàotángshan Guo Shì Mù Shí Cí, literally 'Xiaotang Mountain Guo Family Tomb Stone Ancestral Hall') is a funerary stone shrine from the early Eastern Han Dynasty (25-220 CE) situated on slopes of the Yellow River valley in the western part of Shandong Province, China. An odometer for measuring distance was first described by Vitruvius around 27 and 23 BCE, although the actual inventor may have been Archimedes of Syracuse (c. 287 BC - c. 212 BCE) during the First Punic War. The odometer was subsequently developed in ancient China, possibly by the profuse inventor and early scientist Zhang Heng (78 CE - 139 CE) of the Han Dynasty (202 BCE-220 CE). Zhang Heng is often accredited with the invention of the first odometer device in China. By the 3rd century (during the Three Kingdoms Period), the Chinese had termed the device as the 'jì l