Understanding World Time Zones Division

The Earth rotates on its axis, completing one full rotation approximately every 24 hours. To manage time across different parts of the globe consistently, the world is divided into major time zones.

Why Time Zones Are Necessary

• As the Earth spins, different parts face the sun at different times, experiencing day and night.
• A single time for the entire planet would be impractical, causing confusion for daily activities like sunrise, noon, and sunset.
• Time zones help standardize local time based on the position of the sun relative to different longitudes.

Calculating Time Zones

The Earth is a sphere, measuring 360 degrees ($360^\circ$) in circumference. Since a full rotation takes 24 hours, the Earth is divided into 24 standard time zones, each theoretically covering 15 degrees of longitude ($15^\circ$). This is calculated as:

$$ \frac{360^\circ \text{ (Total Circumference)}}{24 \text{ hours (Rotation Period)}} = 15^\circ \text{ per hour} $$

The reference point for time zones is the Prime Meridian, located at 0 degrees longitude, which uses Coordinated Universal Time (UTC), formerly known as Greenwich Mean Time (GMT).

Analyzing the Options

Based on the standard system derived from Earth's 24-hour rotation:

• Option 1 (12): This number relates to 12-hour clocks but not the total number of standard time zones.
• Option 2 (30): This number does not correspond to the standard global time zone system.
• Option 3 (24): This accurately represents the number of major, hour-based time zones the world is divided into.
• Option 4 (None of these): Incorrect, as 24 is the correct number.

Therefore, the world is divided into 24 major time zones.