NEXT MEETING: Wednesday, August 17, 2022, 7PM, online via Zoom: 7:00 PM: The GCAS welcomes West-Mexican archaeologist Manuel Dueñas Garcia as our Featured Speaker. As usual for our Zoom meetings we invite everyone to hop online about 6:45 PM to get settled while we have a brief-to-nonexistent business meeting. Manuel will begin his presentation at 7PM sharp to share his perspectives on Aguascalientes Archaeology and the Northern border of Mesoamerica during the Epiclassic (600-900 CE). Members, check your email about a week prior to the meeting to receive your Zoom link. We'll see you online as Manuel discusses new insights about our region.

NEXT FIELD TRIP: TBA but meanwhile, remember that to protect vulnerable resources we offer our field trips to members only. Members’ invited guests are welcome, as long as they ride in that member’s vehicle.

Fish Identification Via Petroglyph Part II
2020 Events A-Plenty

More Comparative Petroglyph Musings

Solar analemma white sandsThere are many multiple-exposure photographs existing throughout cyberspace that illustrate the solar analemma. Each week, a dedicated photographer photographs the sun from the same position during the course of a full year. The result is a photograph of 48 to 52 images of the sun in the shape of what most people recognize as a figure-eight, i.e., the "infinity" symbol. If photographed from the Northern Hemisphere the highest point of the analemma is the sun's position at the summer solstice and the lowest point is the position of the winter solstice. The path of the moon follows a similar analemma shape. Here on the right is one sample of a solar analemma via weatherscapes.com:

Canon de chelly infinity petroglyphFor comparison, here is a stock photo of an analemma petroglyph at Cañon de Chelly. It has been accepted that certain petroglyphs appear to track certain specific celestial events, including solstices and equinoxes. So is it too far-fetched to suggest that figure-eight petroglyph images reflect someone's tracking of the path of the sun and/or moon during the course of an entire year?

Happy 2020 to all!

/s/ webmaster

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