The Mayans were very successful with planting/harvesting crops because they created accurate calendars overtime by studying the weather and the stars. These calendars gave them indications for when to plant their crops, and when to harvest.
One reason the Mayas were so successful at farming was because they studied the stars and the weather. This meant they were able to create very detailed calendars which told them what time of year to plant crops and when they should harvest them.
