What areas would the Mayans need to be skilled in to complete the Kukulcán pyramid?

It was a blend of architectural skill combined with astronomical knowledge.

Explanation:

The endeavor itself was so precise that the pyramid reflected the architectural skill and precise knowledge of astronomical phenomena. The Kukulkan Temple during the autumn and spring equinox created a shadow that in the northern part of the pyramid looked like a massive snake descending the pyramid. This ingenious detail that happened twice a year is proof of the Mayan knowledge of astrology and his incredible architectural abilities. Some scientists believe that the pyramid refers to the Mayan calendar.

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