People take in the first rays of sun during the vernal equinox on top of the Pyramid of the Sun in Teotihuacan, Mexico, on Monday, March 20, 2006. The equinox, the halfway point between winter and summer, arrived shortly after noon to the pyramids, located 30 miles north of Mexico City.
A couple observe the Pyramid of the Moon on top of the Pyramid of the Sun in Teotihuacan, Mexico, on Monday, March 20, 2006. The pilgrims believe the pyramids hold a special energy on the equinox that can be transmitted to people, especially those who dress in white. The day marks the sun's crossing of the equator, when night and day are nearly the same length throughout the world.
Federal agents are assigned to stand guard on top of the Pyramid of the Sun in Teotihuacan, Mexico, on Monday, March 20, 2006. People from across the country make an annual pilgrimage to the ruins, climbing the tallest structure, the Pyramid of the Sun, and throwing their arms skyward. Some climb the Pyramid of the Moon, shown behind the agents, which is older, but not as high.
Performers dressed as Aztecs perform the dance of the four winds around the Sun Pyramid at the Teotihuacan archeological site on Monday, March 20, 2006. The pilgrims believe the pyramids hold a special energy on the equinox that can be transmitted to people, especially those who dress in white.
A performer in Aztec clothing performs the dance of the four winds around the Sun Pyramid at the Teotihuacan archeological site in Mexico on Monday, March 20, 2006. Large crowds were expected at Teotihuacan on Tuesday, the first full day of spring, which this year falls on a national holiday commemorating the 200th anniversary of the birth of revolutionary hero Benito Juarez.
People take in the first rays of sun during spring equinox on top of the Pyramid of the Sun in Teotihuacan, Mexico on Monday, March 20, 2006. The pilgrims believe the pyramids hold a special energy on the equinox that can be transmitted to people, especially those who dress in white.