The first, known as the Calendar Round, was based on two overlapping annual cycles: a 260-day sacred year and a 365-day secular year. Under this system, each day was assigned four pieces of identifying information: a day number and day name in the sacred calendar and a day number and month name in the secular calendar. Every 52 years counted as a single interval, or Calendar Round. After each interval the calendar would reset itself like a clock.
The Maya strongly believed in the influence of the cosmos on daily life. Consequently, Mayan knowledge and understanding of celestial bodies was advanced for their time: For example, they knew how to predict solar eclipses. They also used astrological cycles to aid in planting and harvesting and developed two calendars that are as precise as those we use today.
achievements- astronomy, agriculture, engineering and communications
One of the reasons why the Roman Empire produced more coins is because the Empire was constantly expanding and they needed to more money in circulation. Another reason was that people would chip the sides off the coins.
The farmers built terraces and also grew their crops on top of the mountains and hills.
The Yellow and Yangtze Rivers
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Killer Asteroids is a very scary thought that nobody would want to happen. An Asteroid crashing into the earth would kill people and destroy the infrastructure in where it lands. Nobody knows what could happen afterwards and any survivors would be lost and helpless.The earth probably wouldn't be able to bounce back it would never be the same.
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