I tried to put moon cycles (both earth viewed and star viewed) into the 18.5 or 9.25 cycles on the petroglyph, but neither worked out to whole numbers. So, I'm stumped, but thought the great minds of this group could probably come up with an answer.

I have a question to test your knowledge of astronomy.

Last week when we were at the Hopi Reservation petroglyph site, the guide was
showing us various places among the over 15,000 petroglyphs and where the
old cultures would track the equinox to help them with spring planting.

There was one location where he said they tracked the moon. The total cycle
ran 18.5 years where it showed 9.25 years from one location to its outer most
point and then 9.25 years back to the same location on the rock...a total of
18.5 years. Again, this what the guide told us.

Does this make sense to you?

Have a nice day.

Regards,

Dennis