Relativity of time

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General Relativity Special Relativity

Michelson and Morley found nothing in 1887 and that null result became physics' most useful measurement The Andromeda paradox: two walkers passing each other disagree about whether a fleet has already launched Light cones: why saying now about Alpha Centauri is a convention and not a fact The twin paradox: the traveller really is younger and acceleration is what breaks the symmetry Hafele and Keating flew caesium clocks around the world in 1971 and the two directions were wrong in opposite ways The train and the two lightning strikes: how Einstein's 1905 thought experiment killed absolute simultaneity Gravity Probe B's gyroscopes and the dragging of spacetime by a rotating Earth The speed of light is not really about light: it is the exchange rate between space and time Two observers disagree about distance and duration but always agree on the spacetime interval Why length contraction is a convention about simultaneity and not a physical squash Rossi and Hall in 1941: cosmic-ray muons reach sea level because their lifetime stretches Why one-way light signals cannot synchronise two clocks without a convention Why free fall and weightlessness are locally indistinguishable and what that does to clocks Distant Type Ia supernovae run slow by exactly their redshift factor Proper time is the only time your body actually experiences

Time Management Future Timeline Calendars Time in life Historical eras Time travel Seasons Endings Units of time