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. In contrast to fashionable calendars, that are based mostly on the photo voltaic 12 months, abacus calendars are based mostly 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 as we speak in some components of the world, significantly in East Asia. They’re usually used for spiritual functions, similar to figuring out the dates of festivals and holidays, they usually may also be used for sensible functions, similar to retaining observe of appointments and occasions. Abacus calendars are a useful device for anybody who’s considering studying extra about Chinese language tradition and historical past, they usually may also be a enjoyable and academic method to study concerning the fundamentals of astronomy.
