Question

When we consider ${15}^o$ meridian on a world map or globe and count them in an Eastward direction starting with Greenwich Meridian ($0^o$) we find that the time of this meridian is ___________.

• A. as Greenwich
• B. 1 hour fast
• C. 1 hour slow
• D. 12 hours fast

Answer 1

Answer: (B)

1 hour fast

As the earth rotates from west to east, those places east of Greenwich will be ahead of Greenwich time and those to the west will be behind it. The earth rotates 360° in about 24 hours, which means 15° an hour or 1° in four minutes. Thus, when it is 12 noon at Greenwich, the time at 15° east of Greenwich will be 15 × 4 = 60 minutes, i.e., 1 hour ahead of Greenwich time.