-1Newton:
law of inertia,f=mxa,for every action there is =&opp reaction, f=Gm1m2/r2, deduces
gravitational force from the orbit of the moon, builds 1
st
reflecting tele, proves planets moving under
gravitational force, obey Keplers laws, Opticks8, light made up of all kinds of colorsKepler:
orbits
of planets are ellipses, not circles,=areas in =timeP2=a3-its why we orbit,7Brache’s assistant, found
shape of orbits=ellipse, New Astronomy1609 Ptolemy:
2 concept of epicycles and deferents to help
explain retrograde loops of the planets astro bible Aristarchus:
heliocentric cosmology1
Eratosthenes:
3calculated the size of the E 240bc, sun overhead at syene and no in Alexandria
Copernicus:
4heliocentric cosmology, MJS lie outside E orbit, De Rev.Orbium Coel. Brahe:5
De
Stella Nova, precise obser of stars and planets Galileo:
6all objects fall w/ the same acceleration,
independent of their masses, built 1
st
tele-refractor Dialogues1632 Young:
light is composed of
waves Einstein:
light sometimes acts as particles, photoelectric effect, the shorter the wavelength, the
higher a photon’s energy PHEn= Plancks constant x speedofL/wavelength Romer:
1675, light travels
at a finited speed&so it takes more time2travel longer distances across space, Jup and moons, 16.5