What is the standard time meridian for zone...

Question 1 / 2707066636ee928f7522a1c51a155

Question 1 of 2707066636ee928f7522a1c51a155

What is the standard time meridian for zone description -1?

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Question 1 of 27070

What is the standard time meridian for zone description -1?

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🔍 Key Concepts

• Each time zone covers 15° of longitude, centered on a standard time meridian that is a multiple of 15° from Greenwich (0°). • The zone description (ZD) tells you how many hours, and in which direction, local time differs from Greenwich Mean Time (GMT/UT). • The sign of the ZD indicates whether the zone is east or west of Greenwich, depending on the convention: ZT = GMT + ZD.

💭 Think About

• Start from Greenwich at 0° with ZD = 0. If the ZD is -1, does that mean the local time is one hour earlier or one hour later than GMT? Use the formula ZT = GMT + ZD to think it through. • Once you know whether ZD = -1 is east or west of Greenwich, multiply the number of hours by 15° to find the longitude of the standard meridian. • Look at the answer choices and decide which ones are full 15° meridians and which are halfway (7 1/2°) values that are not standard meridians.

✅ Before You Answer

• Confirm that 1 hour of time difference = 15° of longitude. • Confirm which side of Greenwich (east or west) corresponds to a negative zone description in the formula you are using. • Eliminate any choice that is not exactly a multiple of 15° from 0°.

Question 1 of 27070

What is the standard time meridian for zone description -1?

0°

7 1/2°W

7 1/2°E

15°E

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