Significance of ancient Indian buildings and petroglyphs

I made an interesting observation the other day. I was watching the PBS program on the Chaka Canyon Indian ruins. They were showing how many of the buildings were aligned to the solar cycles and lunar cycles. They also talked about how the moons orbit was off by several degrees to the rotation of the earth. This caused a cyclic patter that takes 18.5 years to complete. Many of the buildings are aligned in the Chaka canyon area to mark where in this cycle the moon is. They also showed how the Spiral pattern that is found on many rocks is also a marker of where in this long lunar cycle they are. Usually combined with this spiral pattern are petroglyphs depicting different animals. I was curious about were we currently were in this long lunar cycle. So, I went to the internet and did a search. What I found was very surprising. What my search brought up were links to farmer’s almanacs, weather, bass fishing, and hunting sites. Apparently, the gravitational pull the moon has on the earth and were the moon is overhead, changes the tidal patterns, which affects the weather patterns. Animals and plants are very sensitive to these patterns. The farmers almanacs tell the farmers when the best time to plant and what crops to plant. It also indicates whether the growing season will be wet, dry, long, short, even what temperature ranges to expect. The bass sites indicated when the bass would be biting based on the lunar cycles. The hunting sites indicated when the game animals would be moving and were they would be based on the lunar cycles. This is exactly the type of information that a group of people living in such a harsh environment would need to survive. They would need to know where and when game would be. They would need to know when and what to plant. The buildings and petroglyphs were not places of worship. They were scientific observation points. The spirals on rock with different animals marked around them were simply indicating when the herds of game would be in the area for hunting. The big buildings aligned with the cycles were used to plan the growing season for their crops. Of course, since the Indians have a great reverence for the planet and nature, I can see how they would plan fun celebrations with dancing and songs of praise based on the changing cycles.