Geochron, Inc. is an American company founded in 1965 by James Kilburg,
an inventor from
Luxembourg. It is also the name of their flagship product, the Geochron Global Time Indicator. The Geochron was the first
world clock
A world clock is a clock which displays the time for various cities around the world.
The display can take various forms:
*The clock face can incorporate multiple round analogue clocks with moving hands or multiple digital clocks with numeric ...
to display day and night on a world map, showing the familiar "bell curve" of light and darkness. The Geochron employs an intricate analog clockwork mechanism for its display, that shows the month, date, day of the week, hours and minutes, the areas of the world currently experiencing
day
A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours, 1440 minutes, or 86,400 seconds. In everyday life, the word "day" often refers to a solar day, which is the length between two so ...
and
night, and the meridian passage of the
sun. The main display is dominated by a world
map, with time zones prominently indicated. At the top of the map are arrows corresponding to each
time zone. As each day progresses, the map is scrolled from left to right by gear mechanisms, and the arrows for each time zone shift their positions relative to a stationary band fixed at the top that has a horizontal series of numbers representing hours. The viewer may read the time by seeing what number his time zone's arrow is currently pointing to. The map is backlit, and a mechanism behind the map defines well-lit and shaded areas that are also stationary relative to the movement of the map. In this way, as time progresses, different areas are shown to be experiencing daytime and night. The center of the lit area lines up with the 12
noon on the stationary time strip. There is also a day-and-month readout below the map, and a minutes readout above.
Each Geochron is assembled upon demand, with prices starting at above $1,500. President
Ronald Reagan
Ronald Wilson Reagan ( ; February 6, 1911June 5, 2004) was an American politician, actor, and union leader who served as the 40th president of the United States from 1981 to 1989. He also served as the 33rd governor of California from 1967 ...
presented a Geochron to
Mikhail Gorbachev
Mikhail Sergeyevich Gorbachev (2 March 1931 – 30 August 2022) was a Soviet politician who served as the 8th and final leader of the Soviet Union from 1985 to dissolution of the Soviet Union, the country's dissolution in 1991. He served a ...
in 1985
as an "example of American ingenuity." In the mid-1980s, the company was selling about 75 clocks per month, increasing to around 200 per month during the
holiday season.
It had 16 employees in 1987.
The Hubble Space Telescope control center at Goddard Space Flight Center uses a Geochron in its day-to-day operations. The European Space Agency displays a Geochron in their command center. The
Smithsonian Institution has called the Geochron the "last significant contribution in timekeeping." The world clock was featured in motion pictures such as ''
Hunt for Red October
''The Hunt for Red October'' is the debut novel by American author Tom Clancy, first published on October 1, 1984, by the Naval Institute Press. It depicts Soviet submarine captain Marko Ramius as he seemingly goes rogue with his country's cu ...
'', ''
Patriot Games'', ''
Clear and Present Danger'' and ''
Three Days of the Condor
''Three Days of the Condor'' is a 1975 American political thriller film directed by Sydney Pollack and starring Robert Redford, Faye Dunaway, Cliff Robertson, and Max von Sydow. The screenplay by Lorenzo Semple Jr. and David Rayfiel was based on ...
''.
Founder James Kilburg died in 1985. His son, James M. Kilburg, had purchased one-third of the company from his father a short time earlier.
Bob Williamson acquired the other two-thirds of the company, and he and the younger Kilburg became partners in managing the business.
After many years in the San Francisco Bay Area, in 2007 Geochron Enterprises was sold and moved to
Oregon City, Oregon,
and became Geochron, Inc. It was sold again in 2015, to Patrick Bolan.
The Geochron World Clock has been updated under new management to include new mapsets, lighting options, and new magnetic
stepper motors. Geochron World Clocks are still built and restored by hand and manufactured at a small machine shop in Oregon City. In September 2019, the company announced that it was preparing to move from Oregon City to
Estacada, Oregon.

In 2018, Geochron released an electronic version of its mechanical clock,
optimized for 4K resolution displays. It includes many features that were unavailable prior to the
internet, including satellite tracking, and demographic layers above different mapsets. All Geochron mapsets are in a
Mercator Projection
The Mercator projection () is a cylindrical map projection presented by Flemish geographer and cartographer Gerardus Mercator in 1569. It became the standard map projection for navigation because it is unique in representing north as up and sou ...
. As of October 2019, the company continues to sell the mechanical version, in addition to the digital version.
References
* {{Cite web, url=https://www.geochron.com, title=Geochron official website, access-date=2018-10-26
External links
Official Website
Clocks
Clock brands
Manufacturing companies based in Oregon
American companies established in 1965
Manufacturing companies established in 1965