Christmas Day is Wednesday, Dec. 25, and as of Monday, Nov. 18, there are exactly 36 days until Christmas — or just five shopping weekends, including the upcoming Black Friday-Cyber Monday blitz. Now ...

Characteristic of this system is the cyclical nature, with the Mayan calendar featuring three common cycles: the Long Count, Tzolk’in (260-day) and the 365-day, solar-based Haab’. Combined ...