If news is broadcast from London at 10 : 30 AM, at what time it will be heard at Baghdad (45° E) ?

The Earth rotates 360° in 24 hours, which means it rotates 15° every hour. Time zones are calculated based on this principle, where every 15° increment east of the Prime Meridian (0° longitude) results in a time gain of one hour. London is located at the Prime Meridian (0°). Baghdad is located at 45° E longitude. To find the time difference, divide the longitude by 15° (45 ÷ 15 = 3). Therefore, Baghdad is 3 hours ahead of London. If the news is broadcast from London at 10:30 AM GMT, the time in Baghdad will be 10:30 AM + 3 hours, which equals 1:30 PM. This calculation is consistent with standard time zone offsets where Baghdad operates at UTC+3.

Sources

1. [1] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 2: The Earth's Crust > Longitude and Time > p. 12