A Discovery Channel Production. (53 minutes, color) (C)1996

This program narrated by Jane Curtin explores planetary orbits, circadian rhythms, time dilation, intergalactic wormholes, and other phenomena to quantify the common denominator of all that exists: time. Experts from Harvard, Columbia, and Tulane Universities; the Center for Biological Timing; and the U.S. Naval Observatory discuss timekeeping innovations, including the pendulum, marine chronometer, atomic clock, and Global Positioning System, and applications of time-related scientific and technologic advances to areas such as navigation, genetics, and space exploration.