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The next meeting of the Chicago Astronomical Society will be held virtually, via Zoom, on Wednesday, June 30, 2021. The meeting begins at 7:00PM; meeting room opens at 6:30 PM to allow people to greet one another.

Speaker: Dr. Mark Christensen
Mark J. Christensen has been involved in amateur astronomy since high school. He was a founding member of the Detroit Astronomical and Astrophotographic Association. Dr. Christensen earned his BS in physics, with a secondary major in mathematics, from Wayne State University. He earned his MS in physics from Purdue U and his Phd in mathematics from Wayne State. In 1984 Dr. Christensen joined the Defense Systems Division of Northrop Grumman as a designer of real-time algorithms for control systems. Since his retirement in 1999, Dr. Christensen has been quite involved in amateur astronomy and astrophotography. He is currently a member of Northwest Suburban Astronomers and is vice president of observing for the Fox Valley Astronomical Society.

Title of Talk: Where is the Moon?
A review and history of the history and difficulty of predicting the precise position of our satellite from earliest times to the present, including a brief discussion of the mathematical gordian knot at the heart of the problem.

To join the meeting, contact CAS president, Jim Cuca . He will send you the login information, i.e., url, meeting ID, and passcode.

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