When you look at a globe, you see a grid of crisscrossing lines. The vertical lines—running from the North Pole to the South Pole—are called . Together with their angular measurement, they define longitude .
Every 15° of longitude roughly corresponds to one . In theory, there are 24 standard time zones (360° ÷ 15° = 24). In practice, time zone boundaries are adjusted for political and economic convenience. meridian longitude
To understand meridian longitude, it is helpful to break down its two components: Longitude ( When you look at a globe, you see
To find your longitude, you need two clocks: When you look at a globe