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What Time is it Anyway? Clocks, Timescales, and How the World Decides What Time It Is
Speaker: Christopher Ekstrom, Chief of Advanced Clock Development, U.S. Naval Observatory. September 27, 2012 (1:13:00)
Math, Myth, and the Measure of Mayan Time
Speaker: William Saturno, Assistant Professor of Archaeology at Boston University. October 22, 2012 (1:19:00)
Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time
Speaker: Dava Sobel on CSPAN-2 on March 5, 2014. (53 mins. Video from the LHL lecture is unavailable)