Work out the time anywhere with a time-zone map
Grade 9 Social Studies Worksheet - Challenge Me
Circle the best answer.
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Card A. Clock time and sun time. Earth turns 360° in 24 hours, so 15° of longitude matches one hour, and 1° matches 4 minutes. A place west of its zone’s reference meridian has its sun highest later than 12:00 on the zone’s clock. UTC+8 is based on 120°E, and UTC−5 (Eastern Standard Time) on 75°W. Card B. China uses one offset, UTC+8, with no daylight saving time. It spans from about 73°E in the west to about 135°E in the east. Kashgar lies in the far west, at about 76°E. Charleston, West Virginia, lies at about 81.6°W.
China uses UTC+8, based on 120°E. At about what Beijing clock time is the sun highest at Kashgar (76°E), Ari asks?
- About 14:56: 44° west of 120°E is 176 minutes late
- About 12:44, treating 44° as 44 minutes
- About 09:04, since a place west of the meridian has noon earlier
- At 12:00, since one offset puts the sun highest at one time
China spans about 62° of longitude with one offset. By how much does the sun’s timing differ from far west to far east, Bo asks?
- About 8 hours, the size of the UTC+8 offset
- About 4 hours: 62° × 4 minutes is 248 minutes
- No difference: with one offset the sun is highest at one clock time
- About 2 hours, since the clock is set in the middle of the span
At about what EST clock time is the sun highest in Charleston (81.6°W), ignoring seasonal drift, Esme asks?
- About 11:34, since a place west of the meridian has noon earlier
- About 12:07, treating 6.6° as 6.6 minutes
- About 12:26: Charleston is 6.6° west of 75°W, 26 minutes late
- At 12:00, since Eastern Standard Time puts noon at 12:00
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Card C. The International Date Line runs roughly along 180°. Crossing it westbound adds a day to the date; crossing eastbound takes a day away. Tokyo is UTC+9. Honolulu is UTC−10, with no daylight saving time. Card D. A flight (made up). It leaves Tokyo at 17:00 on Tuesday, flies east for 8 hours and lands in Honolulu. The return flight leaves Honolulu at 06:00 on Tuesday and flies west for 8 hours.
The flight leaves Tokyo at 17:00 on Tuesday and flies east for 8 hours. What are the arrival time and date in Honolulu, Jun asks?
- 06:00 on Tuesday: Tokyo’s clock reads 01:00 Wednesday, 19 hours ahead
- 06:00 on Wednesday, right time but the eastbound crossing did not change the date
- 20:00 on Wednesday, since the 19-hour gap is added to the arrival time
- 01:00 on Wednesday, adding the flight time to the clock
Which statement about the eastbound flight is right, Kira asks?
- By the clock it lands 8 hours after it took off, as the flight lasts 8
- By the clock it lands the next day, since eastbound flights add a day
- By the clock it lands 11 hours before it took off, though 8 hours passed
- By the clock it lands 27 hours after it took off, 8 plus 19
The return flight leaves Honolulu at 06:00 on Tuesday and flies west for 8 hours. What are the arrival time and date in Tokyo, Luz asks?
- 09:00 on Tuesday, right time but the westbound crossing did not add a day
- 19:00 on Monday, subtracting the 19-hour gap from 14:00
- 14:00 on Tuesday, adding just the flight time to Honolulu’s clock
- 09:00 on Wednesday, since westbound adds a day
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Card E. Sydney and Charleston in 2027, under the rules on the cards: Charleston is on UTC−4 from 14 March. Sydney is on UTC+11 until 4 April and then on UTC+10.
Which city is ahead on 20 March 2027, and by how many hours: Sydney or Charleston, Milo asks?
- Sydney, by 14 hours, as in July
- Sydney, by 16 hours, as in January
- Charleston, by 15 hours, since −4 is a bigger number than +11
- Sydney, by 15 hours: +11 against −4
A meeting is at 9:00 in Charleston on 20 March 2027. What are the time and date in Sydney, Noah asks?
- 01:00 on 21 March, using the January gap of 16 hours
- 23:00 on 20 March, using the July gap of 14 hours
- 00:00 on 21 March, 15 hours later
- 18:00 on 19 March, subtracting the 15 hours
Use this
Card A. Clock time and sun time. Earth turns 360° in 24 hours, so 15° of longitude matches one hour, and 1° matches 4 minutes. A place west of its zone’s reference meridian has its sun highest later than 12:00 on the zone’s clock. UTC+8 is based on 120°E, and UTC−5 (Eastern Standard Time) on 75°W.
Ren’s note says: “Each hour of time matches 15° of longitude, so Earth turns 360° in 15 hours.” Which fix is right?
- Change it: each hour matches 24° of longitude and 15 hours make a turn
- Leave it: 15° is the hour size, so 15 hours make a turn
- Change it: 360° ÷ 15° is 24, so Earth turns once in 24 hours
- Change it: 1° of longitude matches one minute of time
Use this
Card C. The International Date Line runs roughly along 180°. Crossing it westbound adds a day to the date; crossing eastbound takes a day away. Tokyo is UTC+9. Honolulu is UTC−10, with no daylight saving time.
Zee’s note says: “Crossing the date line eastbound adds a day.” Which fix is right?
- Change it: eastbound adds a day on the return trip alone
- Leave it: eastbound adds a day, since eastern places are ahead
- Change it: eastbound takes a day away; westbound adds one
- Change it: neither direction changes the date, just the clock
