Wednesday, 2:15–3:40, Apr. 4
Rose Gallery at Reston Community Center Lake Anne
Instructor: Jeffrey L. Kretsch
Coordinator: Mary Kornreich
Today we routinely look at our watch or a phone for the time and to plan our activities. This course covers how time was originally determined by the sun, moon, and stars. Time was very local and every town and city had its own time. With the rise of communication through the telegraph and telephone and fast travel by train, suddenly the issue of which time to use arose. The need for train schedules led to the implementation of standard time zones. Time further became more central to our lives with the rise of the industrial revolution and the necessity of adopting a measure to determine how employees are paid. The apparent motion of the sun over the year, the seasons, lunar and planetary cycles, and the stars during the year will also be covered. This lecture is followed by an optional nighttime visit by carpool to view the stars on Friday, April 20. See special event 1014.
Dr. Jeffrey L Kretsch is a retired federal employee who worked in research and development. He has a PhD from Purdue University and MS and BA degrees in astronomy and physics.