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Humanity’s quest for a synchronized world clock has spanned millennia: Chapter 2: Reference Systems - NASA Science

: The "starting point" for world time is the Prime Meridian (0° longitude) in Greenwich, London. world clock time

The Essential Guide to World Clock Time: Navigating Our Globalized Reality Humanity’s quest for a synchronized world clock has

: Coordinated Universal Time (UTC) is the primary scientific standard used to regulate clocks worldwide. While Greenwich Mean Time (GMT) is often used interchangeably, GMT is a time zone, whereas UTC is a precise time standard based on atomic clocks . GMT is a time zone

The world is divided into , each representing roughly one hour of the Earth's 24-hour rotation cycle.