Answer:
The Maya civilization, which existed in what is now Mexico and Central America, is known for creating a sophisticated calendar and number system that included the concept of zero. The Maya calendar was a complex system that combined several different calendars, including a solar calendar, a lunar calendar, and a sacred calendar, to keep track of time. The Maya also developed a number system that used a base-20 system (known as the vigesimal system) and included the concept of zero, which allowed for the calculation of large numbers and the creation of sophisticated mathematical equations.