1:00 p.m.
Explanation
The Earth rotates on its axis from west to east, completing a full circle of 360° in approximately 24 hours. This rotation establishes a direct relationship between longitude and time, where places to the east of a reference point are ahead in time, and places to the west are behind.Calculation Analysis:
- Rate of Rotation: Since the Earth covers 360° in 24 hours, it covers 15° in 1 hour ($360 \div 24 = 15$). Alternatively, it takes 4 minutes to cover 1° of longitude.
- Direction: The location 15° East of Greenwich. Locations to the east are ahead of Greenwich Mean Time (GMT).
- Time Difference: Since 15° corresponds to a 1-hour difference, the time at 15° East is 1 hour ahead of the time at Greenwich.
- Final Calculation:
- Time at Greenwich = 12:00 noon.
- Time at 15° East = 12:00 noon + 1 hour = 1:00 p.m.
Key Takeaway: Local time changes by one hour for every 15° of longitude; time advances towards the East and recedes towards the West relative to the Prime Meridian.