Ivy Kupec is a media officer at the U.S. National Science Foundation. She contributed this article to Live Science's Expert Voices: Op-Ed & Insights.
Prior to the mid-18th century, it was tough to be a sailor — you couldn't set out for a specific destination and have any real hope of finding it quickly if the trip required east-west travel.
At the time, sailors had no reliable method for measuring longitude, the coordinates that measure how far east and west one is from the international dateline. Longitude's key was accurate timekeeping, as the English watchmaker John Harrison knew, and clocks just weren't accurate yet.and expert technic exploring thinking this is mathote and future diffrent
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