LONGITUDE .DAY

MERIDIANS

Lines of longitude -- meridians -- run from pole to pole, dividing Earth into 360 degrees. The Prime Meridian at 0 degrees passes through Greenwich, England, establishing the reference point for all east-west measurement. Every meridian is a great circle, each one the same length, each one connecting the North Pole to the South Pole through a unique path across the planet's surface.

0.0000° — Prime Meridian, Greenwich

TIME ZONES

Longitude creates time. Every 15 degrees of longitude equals one hour. The sun crosses one degree of longitude every four minutes, making its way around the full 360 degrees in 24 hours. This simple relationship between angle and time is the foundation of every clock, every schedule, every coordinated moment across the globe.

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