An abacus calendar is a sort of calendar that makes use of an abacus to symbolize the times, months, and years. Abacus calendars had been first developed in China through the Han Dynasty (206 BCE – 220 CE), they usually had been used for hundreds of years to maintain observe of time. Not like trendy calendars, that are primarily based on the photo voltaic 12 months, abacus calendars are primarily based on the lunisolar 12 months, which is the time it takes for the moon to orbit the Earth 12 occasions. Subsequently, the size of every month in an abacus calendar can range between 29 and 30 days.
Abacus calendars are nonetheless used right now in some components of the world, significantly in East Asia. They’re typically used for non secular functions, corresponding to figuring out the dates of festivals and holidays, they usually will also be used for sensible functions, corresponding to holding observe of appointments and occasions. Abacus calendars are a precious device for anybody who’s involved in studying extra about Chinese language tradition and historical past, they usually will also be a enjoyable and academic technique to be taught concerning the fundamentals of astronomy.
