The continental spot ruler is 46.08 cm. According to what ancient books? How do you know it is so many meters long? Are there any historians and professors in this field?

The ancient book records that "Lu Banchi is one foot, four inches and four minutes, eight inches between feet, and one inch is accurate and one inch is eight minutes." The "bending ruler" is a carpenter's ruler used by ancient carpenters, and its length is the same as that of the building ruler promulgated by the Ministry of Industry of the imperial court in previous dynasties. Because the building in Ming and Qing Dynasties is 32 cm long, Lu Banchi is 46.08 cm long, and Lu Banchi is 5.76 cm per inch. There are very few Lubanchi handed down from generation to generation. There is a Lu Banchi in the collection of Beijing Palace Museum, which is 46 cm long, which is very close to the length of Lu Banchi recorded in ancient books.