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00:01:04
See how patterns of light change throughout the day at Chaco, and hear G.B. Cornucopia and Shelly Valdez share their impressions of the phenomena of light cycles in Chaco Canyon.

00:10:00
Stephanie Chasteen speaks with Zan Stine, a graduate student in the Earth and Planetary Sciences Department at the University of California at Berkeley, at the annual American Geophysical Union meeting. Mr. Stine tells us about his search for the reasons why summer is coming earlier than it did in the past.

02:03:07
Celebrate the spring equinox at the Mayan ruins of Chichén Itzá, in the state of Yucatan, Mexico. The alignment of the sun on this day creates the appearance of a shadow, in the form of a serpent, that descends the main staircase of the great pyramid. The Live@Exploratorium crew is there to capture the snake on film and to speak with local archaeologists, archeoastronomers, and solar scientists about this amazing phenomenon.

0:59:00
Join the Live@ crew and NASA scientists as we delve into the ancient knowledge of the Chacoans, daily sky watchers who amassed a great knowledge about the movements of the sun. And learn why today's astronomers and solar physicists continue to watch the sun, using modern ground-based observatories and orbiting space telescopes.

00:03:02
Join us in Chaco Canyon to think about what we can learn from watching shadows.

00:00:27
Watch as the square of light moves across the wall and niches at Rinconada.