The farming calendar could accurately track seasons and leap years.
“Our hypothesis is that they used the whole Valley of Mexico. Their working instrument was the Basin itself. When the sun rose at a landmark point behind the Sierras, they knew it was time to start planting,”When viewed from a fixed point on Earth, the sun doesn’t follow the same trajectory every day. During the winter, the sun runs south of the celestial equator and rises toward the southeast. As the longer days of summer approach, the sunrise moves northeast due to the Earth’s tilt.
“The Aztecs were just as good or better as the Europeans at keeping time, using their own methods,” saidThe observatory could also have a modern function today. Historical images show that the forest is slowly climbing up Mount Tlaloc, possibly due to an increase in average temperatures at lower elevation.
“In the 1940s the tree line was way below the summit. Now there are trees growing in the summit itself,”
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