tun

…by those years but by tuns (360 days) and their multiples of 20: katuns (20 tuns), baktuns (400 tuns), pictuns (8,000 tuns), calabtuns (160,000 tuns), and kinchiltuns (3,200,000). In practice, the last three were seldom used. The tun comprised 18 uinals, each of 20 kins (days), but these did not…