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WikiPedia: Thời_gian_trong_vật_lý http://www.phys.lsu.edu/mog/mog9/node9.html http://eo.nso.edu/MrSunspot/answerbook/sundial.htm... http://solar-center.stanford.edu/AO/dawn-rising.ht... http://tycho.usno.navy.mil/gpstt.html http://www.rarebookroom.org/Control/galsid/index.h... //en.wikipedia.org/wiki/Eratosthenes //en.wikipedia.org/wiki/Fred_Hoyle //en.wikipedia.org/wiki/Galileo //en.wikipedia.org/wiki/Naked-eye_stars //en.wikipedia.org/wiki/Operational_definition