Worksheet

Work out the time anywhere with a time-zone map

Grade 9 Social Studies Worksheet - Challenge Me

NameDate

Circle the best answer.

  1. Read this first

    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. 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.

  2. 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 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
    • About 14:56: 44° west of 120°E is 176 minutes late
    • About 12:44, treating 44° as 44 minutes

  3. 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
    • No difference: with one offset the sun is highest at one clock time
    • About 4 hours: 62° × 4 minutes is 248 minutes
    • About 2 hours, since the clock is set in the middle of the span

  4. At about what EST clock time is the sun highest in Charleston (81.6°W), ignoring seasonal drift, Esme asks?

    • About 12:07, treating 6.6° as 6.6 minutes
    • At 12:00, since Eastern Standard Time puts noon at 12:00
    • About 11:34, since a place west of the meridian has noon earlier
    • About 12:26: Charleston is 6.6° west of 75°W, 26 minutes late

  5. 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. 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.

  6. 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 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
    • 06:00 on Tuesday: Tokyo’s clock reads 01:00 Wednesday, 19 hours ahead

  7. Which statement about the eastbound flight is right, Kira asks?

    • By the clock it lands 11 hours before it took off, though 8 hours passed
    • By the clock it lands the next day, since eastbound flights add a day
    • By the clock it lands 27 hours after it took off, 8 plus 19
    • By the clock it lands 8 hours after it took off, as the flight lasts 8

  8. 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?

    • 14:00 on Tuesday, adding just the flight time to Honolulu’s clock
    • 09:00 on Wednesday, since westbound adds a day
    • 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

  9. Use this

    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.

  10. A meeting is at 9:00 in Charleston on 20 March 2027. What are the time and date in Sydney, Noah asks?

    • 00:00 on 21 March, 15 hours later
    • 01:00 on 21 March, using the January gap of 16 hours
    • 23:00 on 20 March, using the July gap of 14 hours
    • 18:00 on 19 March, subtracting the 15 hours

  11. Use this

    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. Card A. Offsets in July, and when clocks change. Charleston: UTC−4 in summer (Eastern Daylight Time, from the second Sunday in March to the first Sunday in November), UTC−5 in winter. London: UTC+1 in summer (British Summer Time, from the last Sunday in March to the last Sunday in October), UTC+0 in winter. Phoenix: UTC−7 all year (Arizona, apart from the Navajo Nation, has not changed clocks since 1968); the Navajo Nation, in northeast Arizona, does change its clocks. Tokyo UTC+9 and Beijing UTC+8: no daylight saving time. Moscow UTC+3 all year since 2014. Sydney: UTC+10 in winter, UTC+11 in summer, from the first Sunday in October to the first Sunday in April.

  12. A staff member says the Charleston–Sydney gap is 14 hours “in summer.” Which season fits the Charleston side, Pia asks?

    • Late March, when Charleston is on −4 and Sydney on +11
    • Northern winter, when Charleston is on −5 and Sydney on +11
    • Any month, since the gap between two cities is fixed
    • Northern summer, when Charleston is on −4 and Sydney is on +10

  13. 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.

  14. 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: 1° of longitude matches one minute of time
    • 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: each hour matches 24° of longitude and 15 hours make a turn

  15. Use this

    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.

  16. Tala’s note says: “Because China has one offset, the sun rises at the same clock time all over China.” Which fix is right?

    • Change it: sun times differ by about 8 hours, the size of the offset
    • Change it: sun times differ by about 1 hour from west to east
    • Leave it: one offset means one clock, so sunrise comes at one time
    • Change it: sun times differ by about 4 hours, west to east
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Work out the time anywhere with a time-zone map

Answer Key - Grade 9 Social Studies Worksheet - Challenge Me

Circle the best answer.

  1. Read this first

    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. 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.

  2. 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 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
    • About 14:56: 44° west of 120°E is 176 minutes late
    • About 12:44, treating 44° as 44 minutes

  3. 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
    • No difference: with one offset the sun is highest at one clock time
    • About 4 hours: 62° × 4 minutes is 248 minutes
    • About 2 hours, since the clock is set in the middle of the span

  4. At about what EST clock time is the sun highest in Charleston (81.6°W), ignoring seasonal drift, Esme asks?

    • About 12:07, treating 6.6° as 6.6 minutes
    • At 12:00, since Eastern Standard Time puts noon at 12:00
    • About 11:34, since a place west of the meridian has noon earlier
    • About 12:26: Charleston is 6.6° west of 75°W, 26 minutes late

  5. 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. 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.

  6. 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 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
    • 06:00 on Tuesday: Tokyo’s clock reads 01:00 Wednesday, 19 hours ahead

  7. Which statement about the eastbound flight is right, Kira asks?

    • By the clock it lands 11 hours before it took off, though 8 hours passed
    • By the clock it lands the next day, since eastbound flights add a day
    • By the clock it lands 27 hours after it took off, 8 plus 19
    • By the clock it lands 8 hours after it took off, as the flight lasts 8

  8. 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?

    • 14:00 on Tuesday, adding just the flight time to Honolulu’s clock
    • 09:00 on Wednesday, since westbound adds a day
    • 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

  9. Use this

    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.

  10. A meeting is at 9:00 in Charleston on 20 March 2027. What are the time and date in Sydney, Noah asks?

    • 00:00 on 21 March, 15 hours later
    • 01:00 on 21 March, using the January gap of 16 hours
    • 23:00 on 20 March, using the July gap of 14 hours
    • 18:00 on 19 March, subtracting the 15 hours

  11. Use this

    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. Card A. Offsets in July, and when clocks change. Charleston: UTC−4 in summer (Eastern Daylight Time, from the second Sunday in March to the first Sunday in November), UTC−5 in winter. London: UTC+1 in summer (British Summer Time, from the last Sunday in March to the last Sunday in October), UTC+0 in winter. Phoenix: UTC−7 all year (Arizona, apart from the Navajo Nation, has not changed clocks since 1968); the Navajo Nation, in northeast Arizona, does change its clocks. Tokyo UTC+9 and Beijing UTC+8: no daylight saving time. Moscow UTC+3 all year since 2014. Sydney: UTC+10 in winter, UTC+11 in summer, from the first Sunday in October to the first Sunday in April.

  12. A staff member says the Charleston–Sydney gap is 14 hours “in summer.” Which season fits the Charleston side, Pia asks?

    • Late March, when Charleston is on −4 and Sydney on +11
    • Northern winter, when Charleston is on −5 and Sydney on +11
    • Any month, since the gap between two cities is fixed
    • Northern summer, when Charleston is on −4 and Sydney is on +10

  13. 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.

  14. 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: 1° of longitude matches one minute of time
    • 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: each hour matches 24° of longitude and 15 hours make a turn

  15. Use this

    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.

  16. Tala’s note says: “Because China has one offset, the sun rises at the same clock time all over China.” Which fix is right?

    • Change it: sun times differ by about 8 hours, the size of the offset
    • Change it: sun times differ by about 1 hour from west to east
    • Leave it: one offset means one clock, so sunrise comes at one time
    • Change it: sun times differ by about 4 hours, west to east