On Thursday, January 14th @ 7pm, Virtual Presentation by Erica Ellingson


All sky watchers are aware of the monthly cycle of the moon phases changing from new to full. But the moon also executes a longer dance across the skies. The 18 year pattern of the “lunar standstills” is harder to track, requiring careful observations of the position of the moon over many years.

In this presentation, we’ll explore the reasons for this long cycle, and look critically at possible evidence that ancient cultures from around the world watched the moon in such detail, and left clues for us to find, hundreds or thousand of years later.


Erica Ellingson is Associate Vice Provost for Undergraduate Education at the University of Colorado Boulder.  She holds degrees in Physics and Astrophysics from MIT and the University of Arizona. She joined the faculty of CU Boulder’s Department of Astrophysical and Planetary Sciences in 1995 and is a Fellow of the Center for Astrophysical and Space Astronomy.

Professor Ellingson’s research focuses on observational cosmology and galaxy clusters. She uses a wide range of telescopes around the world and in space to explore the properties of galaxies and dark matter at multiple wavelengths. Her projects also include work with ancient astronomy in the southwest U.S. She teaches courses on cosmology, galaxies, observational techniques and archaeo-astronomy. She is Director of the Science, Technology and Astronomy Recruits (CU – STARS), an undergraduate student outreach program that brings space-themed activities to schools across Colorado.

In her current role as AVP, Professor Ellingson is responsible for assisting in the implementation of initiatives associated with new students at CU, including the First-Year Seminar program and the development of Freshman Interest Groups (FIGs). These programs work with faculty and students, with the goal of supporting first-year students in the University of Colorado  Boulder community and allowing them the opportunity to achieve their individual success goals.

Outside of her professional activities, Professor Ellingson enjoys trekking and backpacking, gardening and travel the world.

ZOOM MEETING INFO: You must have the passcode below to enter the meeting

Join Zoom Meeting

Meeting ID: 815 9642 3906
Passcode: 255320

One tap mobile
+13462487799,,81596423906# US (Houston)
+16699006833,,81596423906# US (San Jose)

Dial by your location
+1 346 248 7799 US (Houston)
+1 669 900 6833 US (San Jose)
+1 253 215 8782 US (Tacoma)
+1 312 626 6799 US (Chicago)
+1 929 205 6099 US (New York)
+1 301 715 8592 US (Washington D.C)
Meeting ID: 815 9642 3906
Find your local number: https://us02web.zoom.us/u/kcywZO2Jm2

Kim Malville’s Virtual Presentation on ““Speculations on the events leading to the creation of the Chimney Rock Great House and those events that followed it’s abandonment.”

Steve Lekson’s Virtual Presentation on “Chaco, North of the San Juan”

2020 Lecture Dates

Please check back for updates.

  • January 9- Michelle Turner, Inaugural Postdoctoral Scholar at Crow Canyon Archaeological Center
  • March 12- Ron Sutcliffe
  • May 13- Steven H. Lekson, “Millennium on the Meridian”
  • July 16- Steven H. Lekson,” Chaco, North of the San Juan”
  • August 13- Larry Baker from Salmon Ruins-CANCELLED
  • September 10-Kim Malville,”Speculations on the events leading to the creationof the Chimney Rock Great House and those events that followed its abandonment around 1125”.