Ancient Observatories: Chaco Canyon Feature Summary

Type:
Physics in Your World
Title:
Ancient Observatories: Chaco Canyon
Description:
This photograph shows the famous Sun Dagger at the Chaco Canyon National Monument in New Mexico, USA, a product of the Pueblo culture around the end of the first millennium A.D.
-- The dagger passed through the center of the spiral at the summer solstice, the longest day of the year.
-- Sadly, in 1989 one of the huge rock slabs that formed these shadows changed its position, possibly due to the effects of visitor activity at the site, so the Sun Dagger is a thing of the past.
-- To find out more, visit Ancient Observatories: Chaco Canyon and The Solstice Project.

[This feature was updated on August 14, 2013.]
Image:
image credit: M. B. Schwenn, (image not available elsewhere on web), <a href="http://www.physicstogo.org/images/features/Sun-dagger-large-3-4-09.jpg" target="_blank">larger image</a>
image credit: M. B. Schwenn, (image not available elsewhere on web), larger image
Image URL:
http://www.compadre.org/Informal/images/features/Sun-dagger-large-3-4-09.jpg
Featured:
March 16, 2009 - April 1, 2009