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Alphabetical index
Timeline of time measurement technology
Timeline
of
time
measurement
technology
270 BC
- Ctesibius builds a popular
water clock
46 BC
-
Julius Caesar
and
Sosigenes
develop a solar calendar with leap years
1502
- Peter Henlein builds the first pocketwatch
1582
-
Pope Gregory XIII
,
Aloysius Lilius
, and Christopher Clavius introduce a
Gregorian calendar
with an improved
leap year
system
1656
-
Christian Huygens
builds the first accurate
pendulum clock
1676
- Motion works and minute hand introduced by Daniel Quare
1680
- Second hand introduced
1737
-
John Harrison
presents the first stable nautical chronometer, thereby allowing for precise
longitude
determination while at sea
1928
- Joseph Horton and Warren Morrison build the first
quartz crystal oscillator clock
1946
-
Felix Bloch
and Edward Purcell develop
nuclear magnetic resonance
1949
- Harold Lyons develops an
atomic clock
based on the quantum mechanical vibrations of the ammonia molecule
2008
- Launch date for the
Primary Atomic Reference Clock in Space
.
See also:
clock