Time Zones

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Across
  1. 1. In 1972, improvements in timekeeping technology led to the ____________ of Coordinated Universal Time(UTC).
  2. 3. When you travel east and pass into another zone, you set your watch ____________ one hour, while westward travel requires that you set it back one hour.
  3. 5. The physical ____________ of the time zones were created by evenly dividing the globe into 24sections to match the day's 24 hours.
  4. 7. Between time zones, only the hour changed; the minutes and ____________ stay the same.
  5. 9. ________________, the half of Earth facing the sun experiences day at the same time the other half experiences night.
  6. 10. When clocks were invented, they were set according to this ____________ of the sun; that is, they were based on solar time.
Down
  1. 2. Trains made it possible to travel long distances very quickly, so ____________ in local solar time made scheduling very confusing.
  2. 4. UTC maintains better ____________ than GMT by adding a leap second to the year whenever necessary, while still using Greenwich as a reference point.
  3. 5. For example, Toronto lies in the time zone that is five hours ____________ UTC, so the time in Toronto is written as UTC-5.
  4. 6. In 1884 the city of Greenwich England, was chosen to be the world's ____________ point for keeping time, and standard time was named Greenwich Mean Time(GMT).
  5. 8. Before clocks, people used the ____________ of the sun to keep track of time.