SIGNAL HILL

Sunrise at the vernal equinox

A PREHISTORIC OBSERVATORY SHARES ITS SECRETS


The following pages describe and illustrate my investigations and documentation of an ancient Hohokam petroglyph site in the Sonoran Desert, near Tucson, Arizona.

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Introduction I Summer Solstice I Equinoxes I Winter Solstice I Lunar Calendar I Sundial I Counting Rock I Volcanic Eruption
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