1564-1642 1693-1776 astronomicalclock astronomicalclocks astronomy astrophysicsandcosmology biografi biographie biography chronometer chronometers chronomètre clockandwatchmakers clocksandwatches clocksandwatchmakers congresses earthsciences france galilei galileo general geodesy geografischelengte geografischelänge geography geophysics/geodesy gmt greatbritain harrison harrisontimekeepers histoire history historyobservatoiredeparis historyofscience historyroyalgreenwichobservatory horlogemakers horology john juvenileliterature juvenileliteratureharrison kendalltimekeepers largetypebooks latitude literatureinitalian longitudecalculationatsearesearch longnowmanualforcivilization lunardistancemethod lunartables measurement measurements meridians(geodesy) messung nauticalastronomy nauticalinstruments navigasjon navigatie navigation nonfiction paris pendulum physicalgeography physics popularscience popularscienceinastronomy research royalsociety scheepvaart schiffschronometer science science(general) sterrenkunde systemsandstandards time to1828