That's pretty interesting and impressive, it must have taken multiple lifetimes for the Mayans to establish such a calendar. I wonder if it had practical purpos

That's pretty interesting and impressive, it must have taken multiple lifetimes for the Mayans to establish such a calendar. I wonder if it had practical purposes beyond studying astronomy - I assume the most common needs (e.g. when to plant and harvest crops) would be better served by a typical annual calendar.