-
3500 BCE
OBELISK
-
2000 BCE
WATER CLOCK
-
1500 BCE
SUNDIAL
-
800
CANDLE CLOCK
-
1000
MECHANICAL CLOCK
-
1100
SUNGLAS
-
1494
HARRISON TIMPLELE
-
PENDULUM CLOCK
-
DIGITAL CLOCK
-
ATOMIC CLOCK
