Disclaimer

Educational content

Everything on this site is for general education. It is not professional advice for research permits, travel planning or teaching curricula.

Visiting sites

Opening hours, access rules and closures at Chaco Culture National Historical Park and archaeological zones in Mexico change. Always check with the official site managers before you travel. Fajada Butte, for example, has been closed to visitors since 1989.

Calculations

Sun positions in our viewers and the sky calendar are computed for an idealised flat horizon without atmospheric refraction. Real sunrise over hills appears later and slightly further south. Event dates can shift by a day with your time zone.

External links and names

Names of institutions and places are used for identification only and do not imply endorsement.

Last updated: November 5, 2026.