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Longitude & time-zone offsets

Use Earth’s 15°-per-hour rotation rate to calculate local standard time from longitude offsets. Review suitability for your learners before teaching.

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Worksheet StudioPractice pack · Ages 13-15

Longitude & time-zone offsets

Take your time. Show your thinking.

1. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 08:00 UTC, what is the local time in that city?
15° · 120° · 8 · 08 · Longitude & time-zone offs…
2. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 13:00 UTC, what is the local time in that city?
15° · 15° · 1 · 13 · Longitude & time-zone offs…
3. Earth rotates 15° of longitude every hour. A city lies at 30° E (UTC+2). When it is 02:00 UTC, what is the local time in that city?
15° · 30° · 2 · 02 · Longitude & time-zone offs…
4. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 02:00 UTC, what is the local time in that city?
15° · 90° · 6 · 02 · Longitude & time-zone offs…
5. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 04:00 UTC, what is the local time in that city?
15° · 60° · 4 · 04 · Longitude & time-zone offs…
6. Earth rotates 15° of longitude every hour. A city lies at 105° E (UTC+7). When it is 07:00 UTC, what is the local time in that city?
15° · 105° · 7 · 07 · Longitude & time-zone offs…
7. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 11:00 UTC, what is the local time in that city?
15° · 120° · 8 · 11 · Longitude & time-zone offs…
8. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 04:00 UTC, what is the local time in that city?
15° · 90° · 6 · 04 · Longitude & time-zone offs…
9. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 09:00 UTC, what is the local time in that city?
15° · 90° · 6 · 09 · Longitude & time-zone offs…
10. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 01:00 UTC, what is the local time in that city?
15° · 120° · 8 · 01 · Longitude & time-zone offs…
11. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 02:00 UTC, what is the local time in that city?
15° · 15° · 1 · 02 · Longitude & time-zone offs…
12. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 07:00 UTC, what is the local time in that city?
15° · 60° · 4 · 07 · Longitude & time-zone offs…

12 questions · Seed 44 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 13-15

Longitude & time-zone offsets

Answers and reasoning. Review before teaching.

1. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 08:00 UTC, what is the local time in that city?
16:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 16:00.
2. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 13:00 UTC, what is the local time in that city?
14:00
15° ÷ 15° per hour = +1 hours ahead of UTC, giving 14:00.
3. Earth rotates 15° of longitude every hour. A city lies at 30° E (UTC+2). When it is 02:00 UTC, what is the local time in that city?
04:00
30° ÷ 15° per hour = +2 hours ahead of UTC, giving 04:00.
4. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 02:00 UTC, what is the local time in that city?
08:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 08:00.
5. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 04:00 UTC, what is the local time in that city?
08:00
60° ÷ 15° per hour = +4 hours ahead of UTC, giving 08:00.
6. Earth rotates 15° of longitude every hour. A city lies at 105° E (UTC+7). When it is 07:00 UTC, what is the local time in that city?
14:00
105° ÷ 15° per hour = +7 hours ahead of UTC, giving 14:00.
7. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 11:00 UTC, what is the local time in that city?
19:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 19:00.
8. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 04:00 UTC, what is the local time in that city?
10:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 10:00.
9. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 09:00 UTC, what is the local time in that city?
15:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 15:00.
10. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 01:00 UTC, what is the local time in that city?
09:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 09:00.
11. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 02:00 UTC, what is the local time in that city?
03:00
15° ÷ 15° per hour = +1 hours ahead of UTC, giving 03:00.
12. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 07:00 UTC, what is the local time in that city?
11:00
60° ÷ 15° per hour = +4 hours ahead of UTC, giving 11:00.

12 questions · Seed 44 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Longitude & time-zone offsets

Take your time. Show your thinking.

1. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 08:00 UTC, what is the local time in that city?
15° · 120° · 8 · 08 · Longitude & time-zone offs…
2. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 13:00 UTC, what is the local time in that city?
15° · 15° · 1 · 13 · Longitude & time-zone offs…
3. Earth rotates 15° of longitude every hour. A city lies at 30° E (UTC+2). When it is 02:00 UTC, what is the local time in that city?
15° · 30° · 2 · 02 · Longitude & time-zone offs…
4. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 02:00 UTC, what is the local time in that city?
15° · 90° · 6 · 02 · Longitude & time-zone offs…
5. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 04:00 UTC, what is the local time in that city?
15° · 60° · 4 · 04 · Longitude & time-zone offs…
6. Earth rotates 15° of longitude every hour. A city lies at 105° E (UTC+7). When it is 07:00 UTC, what is the local time in that city?
15° · 105° · 7 · 07 · Longitude & time-zone offs…
7. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 11:00 UTC, what is the local time in that city?
15° · 120° · 8 · 11 · Longitude & time-zone offs…
8. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 04:00 UTC, what is the local time in that city?
15° · 90° · 6 · 04 · Longitude & time-zone offs…
9. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 09:00 UTC, what is the local time in that city?
15° · 90° · 6 · 09 · Longitude & time-zone offs…
10. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 01:00 UTC, what is the local time in that city?
15° · 120° · 8 · 01 · Longitude & time-zone offs…
11. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 02:00 UTC, what is the local time in that city?
15° · 15° · 1 · 02 · Longitude & time-zone offs…
12. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 07:00 UTC, what is the local time in that city?
15° · 60° · 4 · 07 · Longitude & time-zone offs…

12 questions · Seed 44 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Longitude & time-zone offsets

Answers and reasoning. Review before teaching.

1. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 08:00 UTC, what is the local time in that city?
16:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 16:00.
2. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 13:00 UTC, what is the local time in that city?
14:00
15° ÷ 15° per hour = +1 hours ahead of UTC, giving 14:00.
3. Earth rotates 15° of longitude every hour. A city lies at 30° E (UTC+2). When it is 02:00 UTC, what is the local time in that city?
04:00
30° ÷ 15° per hour = +2 hours ahead of UTC, giving 04:00.
4. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 02:00 UTC, what is the local time in that city?
08:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 08:00.
5. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 04:00 UTC, what is the local time in that city?
08:00
60° ÷ 15° per hour = +4 hours ahead of UTC, giving 08:00.
6. Earth rotates 15° of longitude every hour. A city lies at 105° E (UTC+7). When it is 07:00 UTC, what is the local time in that city?
14:00
105° ÷ 15° per hour = +7 hours ahead of UTC, giving 14:00.
7. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 11:00 UTC, what is the local time in that city?
19:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 19:00.
8. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 04:00 UTC, what is the local time in that city?
10:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 10:00.
9. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 09:00 UTC, what is the local time in that city?
15:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 15:00.
10. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 01:00 UTC, what is the local time in that city?
09:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 09:00.
11. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 02:00 UTC, what is the local time in that city?
03:00
15° ÷ 15° per hour = +1 hours ahead of UTC, giving 03:00.
12. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 07:00 UTC, what is the local time in that city?
11:00
60° ÷ 15° per hour = +4 hours ahead of UTC, giving 11:00.

12 questions · Seed 44 · Age guidance, not curriculum certification