A mesolithic calender monument in Aberdeenshire, Scotland, is considered to be the "World's Oldest Known Calender", believed to have been built about 8,000 BCE. First excavated in 2004.
4000 BCE
Sexagesimal Timekeeping Methods Developed
3500 BCE
Ancient Egyptian Obelisks and the first Shadow Clocks
1500 BCE
Sundials and the rise of the Shadow Clock
1500 BCE
Earliest known Water Clock left behind in Egyptians Pharaoh's tomb
600 BCE
Nocturnal Clocks and the Egyptians' Merkhet
328 BCE
The recorded use of Water Clocks in the Hellenic World
Period: 500 to 599
The development of the Incense Clock
520
Oldest record of the Candle Clock
Jan 1, 996
The First recorded Mechanical Clock made in Europe
Jan 1, 1000
The Hourglass and its Nautical Origins
Period: Jan 1, 1000 to Jan 1, 1399
Development and Widespread use of the Astronomical Clock
The first Pendulum Clock invented was Dutch
The Spiral Balance: Rise of the accurate Pocketwatch
