# History of Physics and Astronomy

This version sorts the important
events by name. The lifetimes of people are highlighted in

blue, important people are in

**bold
blue**.

## E

Earthquake waves used by Oldham to prove that
the Earth has a core 1906

Eclipse of the Sun 1560

Eddington
1882-1944Eight fold way 1961

**Einstein 1879-
1955**Einstein – Nobel prize for Physics 1921

Electric arc – Humphrey
Davy 1801

Electric charge - distinction between positive and negative - Charles du Fay
1733

Electric motor - Faraday 1821

Electric motor – Jacobi 1834

Electric light
bulb – Edison 1878

Electrolysis – Faraday's laws 1832

Electromagnetic induction
1824

Electromagnetic theory – Maxwell 1864

Electromagnets - Sturgeon
1820

Electron – particle named by Stoney who also estimated its mass
1874

Electron – name proposed for the fundamental unit of charge (?)1881

Electron
– negative energy states – Dirac 1928

Electron – relativistic quantum mechanical
description - Dirac 1928

Electron diffraction – Davisson, Germer and Thomson
1927

Electron- microscope 1931

Electron microscope – Ruzcka 1937

Electron
spin – Uhlenbeck and Goudsmit 1925

Electronic computer developed - Turing 1943

Electronic computer – ENIAC – general purpose 1946

Electrons 'discovered' –
J.J.Thomson 1897

Electroscope – Haukesbee 1705

Electrostatic accelerator –
Cockcroft and Walton 1929

Electro-weak forces – unification. Weinberg and Salam
1967

Element 104 discovered 1968

Elliptical orbits – Sommerfield 1916

Empedocles- optical tentacles theory of vision 444 BC

Enigma
decoded – Bletchley park 1943

Entropy idea proposed Clapeyron 1834

Entropy –
Clausius 1865

**Eratosthenes – size of the Earth- 24000 miles
275-194 BC**Eta 0 discovered 1962

Euclid – laws of reflection of light 300
BC

Eudoxus – spheres theory 400-355 BCEverest- first
ascent – Hilary and Tensing 1953

Expansion – thermal - Henning's method
1907

Expansion of Universe demonstrated - Hubble 1929

Explorer I 1958