Lecture: "The End of Time: The Maya Mystery of 2012"
How was "The Tyme Appointed"? Autumn 2005 Colonial
Williamsburg; The Journal of the Colonial Williamsburg Foundation. Selected
for inclusion in an anthology of journal stories, " A Place by them Called James Towne", to be published in 2007.
An Astronomer Reads Archeology's Message in Astronomy Magazine, October, 2002
Tiempo , Astronomia, y Ciudades del Mexico Antiguo in ARQUEOLOGIA MEXICANA, vol. 7, 2000
Time, Number & History in the Maya Worldin KRONOS, vol. 1, 2001.
Other Stars than Ours (Named a notable essay in THE BEST AMERICAN SCIENCE & NATURE WRITING OF 2001) in Natural History, April 2001.
Is Harmony at the Heart of Things? (Named a notable essay in THE BEST AMERICAN ESSAYS OF 2001) in The Wilson Quarterly, Winter 2001.
Solving the Mystery of the Nasca Lines
The Star of Bethlehem
How People Mark Time