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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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Age band:Ages 13-15 Ages 16-18

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Worksheet StudioPractice pack · Ages 16-18

Longitude & time-zone offsets

Take your time. Show your thinking.

1. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 05:00 UTC, what is the local time in that city?
15° · 60° · 4 · 05 · Longitude & time-zone offs…
2. Earth rotates 15° of longitude every hour. A city lies at 45° E (UTC+3). When it is 03:00 UTC, what is the local time in that city?
15° · 45° · 3 · 03 · Longitude & time-zone offs…
3. 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…
4. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 01:00 UTC, what is the local time in that city?
15° · 15° · 1 · 01 · Longitude & time-zone offs…
5. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 03:00 UTC, what is the local time in that city?
15° · 90° · 6 · 03 · Longitude & time-zone offs…
6. Earth rotates 15° of longitude every hour. A city lies at 105° E (UTC+7). When it is 06:00 UTC, what is the local time in that city?
15° · 105° · 7 · 06 · Longitude & time-zone offs…
7. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 10:00 UTC, what is the local time in that city?
15° · 120° · 8 · 10 · Longitude & time-zone offs…
8. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 09:00 UTC, what is the local time in that city?
15° · 120° · 8 · 09 · Longitude & time-zone offs…
9. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 07:00 UTC, what is the local time in that city?
15° · 90° · 6 · 07 · Longitude & time-zone offs…
10. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 08:00 UTC, what is the local time in that city?
15° · 15° · 1 · 08 · Longitude & time-zone offs…
11. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 03:00 UTC, what is the local time in that city?
15° · 15° · 1 · 03 · Longitude & time-zone offs…
12. 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…

12 questions · Seed 43 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 16-18

Longitude & time-zone offsets

Answers and reasoning. Review before teaching.

1. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 05:00 UTC, what is the local time in that city?
09:00
60° ÷ 15° per hour = +4 hours ahead of UTC, giving 09:00.
2. Earth rotates 15° of longitude every hour. A city lies at 45° E (UTC+3). When it is 03:00 UTC, what is the local time in that city?
06:00
45° ÷ 15° per hour = +3 hours ahead of UTC, giving 06:00.
3. 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.
4. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 01:00 UTC, what is the local time in that city?
02:00
15° ÷ 15° per hour = +1 hours ahead of UTC, giving 02:00.
5. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 03:00 UTC, what is the local time in that city?
09:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 09:00.
6. Earth rotates 15° of longitude every hour. A city lies at 105° E (UTC+7). When it is 06:00 UTC, what is the local time in that city?
13:00
105° ÷ 15° per hour = +7 hours ahead of UTC, giving 13:00.
7. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 10:00 UTC, what is the local time in that city?
18:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 18:00.
8. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 09:00 UTC, what is the local time in that city?
17:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 17:00.
9. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 07:00 UTC, what is the local time in that city?
13:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 13:00.
10. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 08:00 UTC, what is the local time in that city?
09:00
15° ÷ 15° per hour = +1 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 03:00 UTC, what is the local time in that city?
04:00
15° ÷ 15° per hour = +1 hours ahead of UTC, giving 04:00.
12. 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.

12 questions · Seed 43 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 16-18

Longitude & time-zone offsets

Take your time. Show your thinking.

1. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 05:00 UTC, what is the local time in that city?
15° · 60° · 4 · 05 · Longitude & time-zone offs…
2. Earth rotates 15° of longitude every hour. A city lies at 45° E (UTC+3). When it is 03:00 UTC, what is the local time in that city?
15° · 45° · 3 · 03 · Longitude & time-zone offs…
3. 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…
4. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 01:00 UTC, what is the local time in that city?
15° · 15° · 1 · 01 · Longitude & time-zone offs…
5. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 03:00 UTC, what is the local time in that city?
15° · 90° · 6 · 03 · Longitude & time-zone offs…
6. Earth rotates 15° of longitude every hour. A city lies at 105° E (UTC+7). When it is 06:00 UTC, what is the local time in that city?
15° · 105° · 7 · 06 · Longitude & time-zone offs…
7. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 10:00 UTC, what is the local time in that city?
15° · 120° · 8 · 10 · Longitude & time-zone offs…
8. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 09:00 UTC, what is the local time in that city?
15° · 120° · 8 · 09 · Longitude & time-zone offs…
9. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 07:00 UTC, what is the local time in that city?
15° · 90° · 6 · 07 · Longitude & time-zone offs…
10. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 08:00 UTC, what is the local time in that city?
15° · 15° · 1 · 08 · Longitude & time-zone offs…
11. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 03:00 UTC, what is the local time in that city?
15° · 15° · 1 · 03 · Longitude & time-zone offs…
12. 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…

12 questions · Seed 43 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 16-18

Longitude & time-zone offsets

Answers and reasoning. Review before teaching.

1. Earth rotates 15° of longitude every hour. A city lies at 60° E (UTC+4). When it is 05:00 UTC, what is the local time in that city?
09:00
60° ÷ 15° per hour = +4 hours ahead of UTC, giving 09:00.
2. Earth rotates 15° of longitude every hour. A city lies at 45° E (UTC+3). When it is 03:00 UTC, what is the local time in that city?
06:00
45° ÷ 15° per hour = +3 hours ahead of UTC, giving 06:00.
3. 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.
4. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 01:00 UTC, what is the local time in that city?
02:00
15° ÷ 15° per hour = +1 hours ahead of UTC, giving 02:00.
5. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 03:00 UTC, what is the local time in that city?
09:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 09:00.
6. Earth rotates 15° of longitude every hour. A city lies at 105° E (UTC+7). When it is 06:00 UTC, what is the local time in that city?
13:00
105° ÷ 15° per hour = +7 hours ahead of UTC, giving 13:00.
7. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 10:00 UTC, what is the local time in that city?
18:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 18:00.
8. Earth rotates 15° of longitude every hour. A city lies at 120° E (UTC+8). When it is 09:00 UTC, what is the local time in that city?
17:00
120° ÷ 15° per hour = +8 hours ahead of UTC, giving 17:00.
9. Earth rotates 15° of longitude every hour. A city lies at 90° E (UTC+6). When it is 07:00 UTC, what is the local time in that city?
13:00
90° ÷ 15° per hour = +6 hours ahead of UTC, giving 13:00.
10. Earth rotates 15° of longitude every hour. A city lies at 15° E (UTC+1). When it is 08:00 UTC, what is the local time in that city?
09:00
15° ÷ 15° per hour = +1 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 03:00 UTC, what is the local time in that city?
04:00
15° ÷ 15° per hour = +1 hours ahead of UTC, giving 04:00.
12. 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.

12 questions · Seed 43 · Age guidance, not curriculum certification