1693-1776 antikytheramechanism(ancientcalculator) antiquities astronomicalclock astronomy biografi biographie biography calendar chronometer chronometers chronomètre clockandwatchmakers clocksandwatches clocksandwatchmakers geografischelengte geografischelänge geography gmt greece greek harrison harrisontimekeepers histoire history horlogemakers horology john kendalltimekeepers largetypebooks literatureinitalian longitude longnowmanualforcivilization lunardistancemethod lunartables measurement messung navigasjon navigatie nonfiction planetariums research royalsociety scheepvaart schiffschronometer science sterrenkunde technology