If it is 12:00 noon at the Prime Meridian (0° longitude), what time is it at 90°

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Question: If it is 12:00 noon at the Prime Meridian (0° longitude), what time is it at 90° East longitude? (2020)

Options:

Correct Answer: 6:00 PM

Exam Year: 2020

Solution:

90° East is 6 hours ahead of the Prime Meridian (90/15 = 6), so it is 6:00 PM.

If it is 12:00 noon at the Prime Meridian (0° longitude), what time is it at 90° East longitude? (2020)

If it is 12:00 noon at the Prime Meridian (0° longitude), what time is it at 90° East longitude? (2020)

Step 1: Understand that the Prime Meridian (0° longitude) is the starting point for measuring time around the world.
Step 2: Know that the Earth is divided into 360 degrees of longitude.
Step 3: Realize that the Earth rotates 360 degrees in 24 hours.
Step 4: Calculate how many degrees the Earth rotates in one hour by dividing 360 degrees by 24 hours. This equals 15 degrees per hour.
Step 5: Determine how many hours ahead or behind a location is from the Prime Meridian by dividing the degrees of longitude by 15. For 90° East, do 90 ÷ 15.
Step 6: Calculate 90 ÷ 15, which equals 6. This means 90° East is 6 hours ahead of the Prime Meridian.
Step 7: Since it is 12:00 noon at the Prime Meridian, add 6 hours to this time.
Step 8: Adding 6 hours to 12:00 noon gives you 6:00 PM.

Time Zones – Understanding how time zones are calculated based on longitudinal differences, specifically that each 15 degrees of longitude corresponds to one hour of time difference.