The Discoverers. Book One : Time

Events

Nile Year

4241 BC - 3200 BC

Egyptians, 365 day calendar, used by Julius Caesar and Copernicus in the 16th C

Rising & Setting of Sun could be predicted

2500 BC

Metonic Calendar

432 BC

Babylonians, 19 yr cycle

Caesar added leap year day

46 BC

Ptolemy

90 AD - 168 AD

Council of Nicaea

325 AD

Church split over date of Easter

The Middle Ages

450 - 1500

Weight Driven CLocks

Approx. 500

Announcing the Canonical Hours

Mechanical Timepieces

Approx. 1300

Turret CLocks

Approx. 1300

Hour is 1/24 day

Approx. 1330

The Renaissance

1501

Gregorian Calendar issued

1582

Isochronism

1583

Galileo makes an equal time pendulum

The Problem of Longitude

Approx. 1600

Pendulum Clock

Approx. 1657

Recoil Escapemwnt

1671

Wheel Spring Assembly

1675

Protestant Reformers adopt Gregorian Calendar

1752

National COnference of French Revolution

1792 - 1805

Tried to create rational, secular calendar

China Revolution

1911

China adopts Gregorian Calendar

Soviet Union tries to dissolve Christian Year

1929 - 1940

Tries to dissolve the Christian Year