Although it doesn't exactly count as a merit of any single person, mechanical tools for measuring the passing of time (ie. clocks, and later watches), urbanization and salaried jobs (paid more or less by the hour) have over the centuries changed the way we view the very time (linear time as opposed to the old cyclic "mythical" time perception). Then there's those astrologers whose discoveries changed our perceptions of the universe, the Earth, the solar system... The developement of archeology, paleontology etc. and evolutionary theories has altered the way we view ourself, our past and our future. Then there's the analytical human sciences - for example psychology and the social sciences - that have changed our understanding of our inner and collective workings and "the art of being human." Although somewhat obscure, the higher-end theoretical physics thinking that was already at full tilt at the beginning of the 20th century delves deep into the workings of time and the universe itself; Einstein is no doubt a name everyone recognizes, but there were and are many others.
The ancient Greek philosophers get points for spirited attempt, though.
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