Work out the time anywhere with a time-zone map

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. 1.

   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
3. 2.

   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
4. 3.

   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

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. 4.

   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
7. 5.

   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
8. 6.

   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

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. 7.

    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
11. 8.

    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

12. 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.

13. 9.

    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

14. 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.

15. 10.

    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