longitude determination

Longitude determination involves finding your position east or west on Earth's surface, which requires knowing the exact time difference between your location and a fixed reference point, like Greenwich, England. By comparing local time (determined by the position of the sun or stars) to Coordinated Universal Time (UTC), navigators can calculate their longitude. Historically, this was done using accurate clocks called marine chronometers. Today, GPS technology uses satellite signals and precise timing to instantly determine longitude, providing accurate positioning worldwide.