PLANET IN AN OLD WORLD MESS
professors
gravity fields
unfinished revolution
Sir Isaac's mistakes
mystery tide
for school kids
Aristotle's muddle
Copernicus's fixed sun mistake
day length clues
heat
democracy and academia
personal
professors
gravity fields
unfinished revolution
Sir Isaac's mistakes
mystery tide
for school kids
Aristotle's muddle
Copernicus's fixed sun mistake
day length clues
heat
democracy and academia