Overview

• Official timings place the instant on Monday at about 18:19–18:20 UTC, corresponding to roughly 12:19–12:20 pm in Mexico City.
• In the United States, published conversions put the change at 2:20 pm ET, 1:20 pm CT, 12:20 pm MT and 11:20 am PT.
• Mexico’s Secretaría de Cultura and INAH are mounting a special operation at Chichén Itzá for the Kukulkán light-and-shadow display, with ticket sales from 8:00 to 16:00 and specified fee exemptions.
• The equinox marks the start of autumn in the Northern Hemisphere and spring in the Southern as the Sun crosses the celestial equator, yielding nearly equal day and night.
• Observances range from rituals at Mexican sites such as Teotihuacán and Monte Albán to spring festivities in Argentina, where many still mark September 21 despite the astronomical date falling on the 22nd.