Beautiful things, found

Twice a year, in the last hours of an afternoon in March or September, a serpent comes down the stairs of the great pyramid at Chichén Itzá.

It isn't carved. No one carries it up. It's made of shadow.

The pyramid is called El Castillo, the castle: a stepped temple in Mexico's Yucatán, built by the Maya sometime between the eighth and twelfth centuries, dedicated to Kukulcán, the feathered serpent. In the days around the equinoxes, the late afternoon sun strikes the pyramid's northwest corner and lays a row of triangles of shade along the balustrade of the northern staircase. As the sun drops, the triangles slide down the steps, one after another, until the lowest one meets the carved stone head of a serpent at the bottom. For a while the staircase looks like a snake arriving home. Then the light goes, and it's a staircase again.

Thousands gather for the spring version. Autumn is the quiet cousin: same serpent, thinner crowd. And you don't have to hit the exact day. The shadow shows for days on either side of the equinox, changing only slightly. This year the September equinox falls just after midnight UTC on September 23, which is early evening on the 22nd in the Yucatán. Sunset there is 5:52; the year turns at 6:05, after the light is gone.

Here's what stays with me: nobody knows if it was on purpose. The Maya tracked the sun closely, and a temple to the feathered serpent where a shadow serpent comes down the stairs could be exactly the point. But the effect runs for days and weeks around the equinoxes, which would be a strange way to build a calendar marker. And one team that surveyed the pyramid's orientation argues the famous equinox connection is mostly ours: the building's main face points at the sunsets of May 20 and July 24, dates that fit the Maya counting system, not the equinoxes at all.

Either way, the snake comes down the stairs. It doesn't wait to be intended.

If you ever stand there: north side, late afternoon, watch the northwest corner, and be patient. You can't climb the pyramid anymore (the monuments were roped off to climbers around 2006, after a visitor fell to her death). You watch from below, like everyone else.

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