This refers to the marine chronometer, perfected by John Harrison in the 18th century, which solved the longitude problem. Sailors could already find latitude using the Sun or stars, but longitude required knowing the exact time difference between a fixed reference and local noon. A precise clock that stayed accurate on a moving ship allowed this comparison. By measuring time shifts, navigators could calculate east west position, making long distance sea travel far safer and enabling global exploration and trade. Want more interesting content like this ? Follow gravitonomy :) Via : Unknown No copyright infringement intended. Kindly DM for Credit/Removal/Collaboration :) #navigation #science #physics #worldmap #maps