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The Conquest of Time Reckoning
SPECTACLES AND SATELLITES I 20
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acid alcohol angle animals atoms beginning body calculate called carbon celestial cells centre century charge chemical circuit closed combination compounds connected contains corresponding declination depends determined direction discovery distance earth effect electrical equal equator experiments fact figure fixed force given gives glass half heat Hence human hydrogen important increased industry knowledge known latitude latter length less light magnetic mass material means measured mechanical mercury meridian metal method minutes moon motion moving nature object observations occur organic oxygen passes period plane plants pole position possible practice pressure principle produced quantity resistance result rising rotation salt scientific separated shows side simple social solution speed star substances surface temperature tion unit volume weight wire