Time Zones

2. Between time zones, only the hour changed; the minutes and ____________ stay the same.
3. For example, Toronto lies in the time zone that is five hours ____________ UTC, so the time in Toronto is written as UTC-5.
6. When clocks were invented, they were set according to this ____________ of the sun; that is, they were based on solar time.
7. 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.
9. 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).
11. ________________, the half of Earth facing the sun experiences day at the same time the other half experiences night.

1. In 1972, improvements in timekeeping technology led to the ____________ of Coordinated Universal Time(UTC).
4. Before clocks, people used the ____________ of the sun to keep track of time.
5. The physical ____________ of the time zones were created by evenly dividing the globe into 24sections to match the day's 24 hours.
8. Trains made it possible to travel long distances very quickly, so ____________ in local solar time made scheduling very confusing.
10. UTC maintains better ____________ than GMT by adding a leap second to the year whenever necessary, while still using Greenwich as a reference point.