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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
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