🔍 Key Concepts

• Time zones and standard meridians are usually spaced 15° of longitude apart • The sign (+ or -) in a zone description tells you how many hours the zone differs from Greenwich Mean Time (GMT) / UTC • Each hour of time difference from Greenwich generally corresponds to 15° east or west longitude

💭 Think About

• How many degrees of longitude away from the prime meridian is a zone that is 12 hours different from UTC? • If you move east from Greenwich, does the description number become positive or negative? How about if you move west? • Among the choices, which longitude matches both the correct distance in degrees from Greenwich and the correct east/west direction for +12?

✅ Before You Answer

• Compute 12 × 15° to find the longitude distance from the prime meridian • Decide whether "+12" means east or west of Greenwich in the standard nautical convention • Check which option(s) have exactly that longitude value and correct E/W designation