At the Sun Dagger in New Mexico,a dagger-shaped beam of sunlight pierces a spiral

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The Sun Dagger is designed to align with the summer solstice, which occurs around June 20-21 each year. At noon on the summer solstice, a dagger-shaped beam of sunlight pierces a spiral carved onto a rock face, creating a striking visual effect. This alignment was likely used by the Ancestral Puebloan people who built the Sun Dagger to mark the start of the summer season and the beginning of the agricultural cycle.

At the Sun Dagger in New Mexico,a Dagger-Shaped Beam of Sunlight