If a clock is set to Greenwich Mean Time and the Sun is observed to reach its zenith at 10:00

Question

Quizplus · Accepted Answer

Greenwich Mean Time is located at 0° longitude. The Sun reaches its zenith at solar noon (when it is at its highest point in the sky) which is 12:00 pm local solar time. Since the Sun reaches its zenith at 10:00 am when the clock is set to GMT, we know that the longitude is east of Greenwich (since the Earth rotates from west to east). To find out how many degrees east, we need to calculate the time difference between solar noon (12:00 pm) and the observed zenith time (10:00 am), which is 2 hours. Since the Earth rotates 15 degrees in one hour (360 degrees divided by 24 hours), the longitude can be calculated as 2 hours times 15 degrees per hour, which equals 30 degrees east of Greenwich. Therefore, the correct answer is C) 30°E.

If a Clock Is Set to Greenwich Mean Time and the Sun