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Book & Research > Solstice Project Papers

A Unique Solar Marking Construct

By Anna Sofaer, Volker Zinser, and Rolf M. Sinclair
Science, 19 October 1979, Volume 206, Number 4416, pp. 283-291

Lunar Markings on Fajada Butte, Chaco Canyon, New Mexico

By Anna Sofaer, Washington, DC, R. M. Sinclair, National Science Foundation, Washington, DC and L. E. Doggett, U.S. Naval Observatory, Washington, DC
Archaeoastronomy in the New World, edited by A.F. Aveni, New York: Cambridge University Press, 1982.

The Great North Road: a Cosmographic Expression of the Chaco Culture of New Mexico

By Anna Sofaer
Solstice Project, Washington, DC, Michael P. Marshall, Cibola Research Consultants, Corrales, New Mexico, and Rolf M. Sinclair , National Science Foundation, Washington, DC
World Archaeoastronomy, edited by A. F. Aveni, New York: Cambridge University Press, 1989.

Inter-site Alignments of Prehistoric Shrines in Chaco Canyon to the Major Lunar Standstill

by Anna Sofaer, Robert Weiner, and William Stone. 2017. In The Science of Time 2016: Time in Astronomy & Society, Past, Present and Future, edited by E. Arias, L. Combrinck, et al, pp. 79-102. Astrophysics and Space Science Proceedings 50. Springer, Cham.

News & Events > Archive

Museum Installation of the Sun Dagger Explorer

Museum Installation of the Sun Dagger Explorer
The Solstice Project's interactive computer model of The Sun Dagger of Chaco Canyon opened May 15, 2009, The New Mexico Museum of Natural History and Science Click here for more information

The Science of Time conference, Harvard University

The Solstice Project’s exciting new findings were presented by the National Geodetic Survey of NOAA and the Solstice Project, at The Science of Time conference, Harvard University, June 5 to 9, 2016. View the
completed poster , the poster abstract, and the conference website: Ancient Timekeepers of Chaco: An Investigation into Possible Lunar Alignments of Prehistoric Shrines by William Stone, Anna Sofaer and Robert Weiner

News & Events > Current

Untold Stories of Chaco Canyon


The New Mexico Museum of Natural History & Science Presents

Untold Stories of Chaco Canyon

with Santa Fe Author Anna Sofaer of the Solstice Project

"Revealing Untold Told Stories of Chaco Canyon: Archaeocosmology"
with Anna Sofaer

at The New Mexico Museum of Natural History & Science
December 12th from 6:30 p.m. to 8:00 p.m. 



For Immediate Release: December 5, 2019 (Albuquerque, New Mexico) The New Mexico Museum of Natural History & Science will present “Revealing Untold Told Stories of Chaco Canyon: Archaeocosmology” on December 12th from 6:30 p.m. to 8:00 p.m. Author Anna Sofaer, and researchers Richard Friedman and Robert Weiner will discuss their latest findings on the Chaco Culture.

The research team uses new three-dimensional computer modeling to examine the complex developments of Pueblo Bonito (considered the most important ritual center in Chaco Canyon). Pueblo Bonito’s intriguing geometric formations united with its solar alignments show the vast mathematical, architectural and astronomical knowledge of the Chacoans.

Pueblo Bonito, the largest house in Chaco Culture National Historic Park had up to 800 rooms built up to four stories using solar alignments. It was built and rebuilt over a span of 300 years. The structure was built by Ancestral Puebloans between 828 and 1126 AD. Items such as copper bells, scarlet macaws, gambling pieces and cacao, reveal rich ceremonial activity in Pueblo Bonito.

The latest research opens a wider window on the American Southwest with comparisons to cosmology centers around the ancient world. The new research uses LiDAR technology to document the enigmatic Chaco “roads” which connect the Great Houses with Great Kivas.

The lecture at the Museum will discuss astronomy’s importance to the Chaco culture as well as unique objects found at the site. The themes and illustrations presented in this talk also form the core of the Solstice Project’s new film in progress: “Pueblo Bonito: Heart of the Chaco World.” The Solstice Project’s earlier films directed by Anna Sofaer, include “The Mystery of Chaco Canyon” and “The Sun Dagger” (broadcast by PBS and narrated by Robert Redford.) For more information visit

Videos and signed books from expert Anna Sofaer will be available for purchase on the evening of the event. The Museum’s one-of-a-kind exhibit on the Sun Dagger (produced by the Solstice Project) will be open for viewing in the Space Science wing.

Tickets are $8 for the general public, $7 for Museum members, and $5 for students. Preregistration is encouraged. Visit for tickets and more details.

(Anna Sofaer rediscovered the Sun Dagger in Chaco Canyon. Her non-profit Solstice Project focuses on research and education of the Chaco culture. Richard Friedman is an expert in GIS (Geographic Information Systems) and has integrated aerial technologies with ground surveying. Robert Weiner, PhD. is a student at the University of Colorado Boulder and has focused his research on Chacoan roads and Mesoamerican objects from Chaco Canyon.)


More Details:

Image: Courtesy: Bob Adams

Media Contact: Andrea Jacquin,">  505-206-9144