Answer:
Stargazing
Step-by-step explanation:
The Mayan civilization was established for centuries in what we know today as Guatemala and southern Mexico. One of the most precious legacies they left us was their calendar.
The Mayans made their calendar to remember important dates in their history, but also for practical purposes, such as knowing when to sow, and ceremonial, to mark the most important religious festivals.
The Mayans built large temples to be able to make astronomical observations. Thanks to this, the priests were able to establish the duration of the lunar cycle, the solar cycle and the cycle of the planet Venus, from which they made their calendars.