Time determination at US Naval Observatory
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TOP19844336
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達志影像
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1900S20THADULTMANAMERICAAMERICANAMERICANASTRONOMERASTRONOMICALASTROPHYSICALASTROPHYSICISTASTROPHYSICSBLACK-AND-WHITECALCULATINGASTRONOMYCAUCASIANCENTURYDCDETERMINATIONDEVICEE.ELMOREEQUIPMENTFRANKHISTORICALHISTORYINSTRUMENTINTERNATIONALJ.LONGITUDEMACHINEUSMALEMEASURINGMONOCHROMENAVALNORTHNORTHOBSERVATORYONEPEOPLEPERSONPERSONPHOTOGRAPHICPZTRESEARCHRESEARCHERROSSSCIENTISTSERVICESIGNALSSTANDARDSTANDARDSSTATESTECHNOLOGICALTECHNOLOGYTIMETIMETIMINGTUBEUNITEDUSUSAWASHINGTONWILLISZENITH