![]() When it is Wednesday in New Zealand it is Tuesday in Samoa. It is the line created to separate one calendar day from the next. The line lies longitudinally between New Zealand and Samoa. ![]() The International Date line is another complication. If you video call a friend at 7:00pm New Zealand time you will wake them up at 6:00am England time. England is 13 hours behind New Zealand time. When you leave Auckland at 11:10am, the time in Perth is 6:10am.Ĭommunicating by email, video call or phone with someone in another part of the world requires you to know the time zones. That is because Auckland time is five hours ahead of Perth time. It turns out that the flight takes 7 hours and 25 minutes. It is hardly worth buying the entertainment and meal package. ![]() That seems like a flight time of only 2 hours and 25 minutes. It leaves at 11:10am and arrives at 1:35pm on the same day. Suppose you book a flight from Auckland to Perth. With the advance of communication technology and air travel, students’ lives are likely to be affected by time zones. Australia has three time zones, Russia has 11 time zones. Large countries have multiple time zones, that is points at which the clock reads midday, e.g. The clocks of time zones are calibrated so that 12 noon is at the midpoint of dawn and dusk in that country. Therefore, midday occurs at different time points around the globe, based on the longitude of the location. It is generally accepted that 12 noon is midday, halfway between dawn and dusk, the rising and setting of the sun. The Earth rotates 360⁰ every 24 hours (roughly) meaning that while it is daylight on one side of the Earth, it is night on the other side, excluding locations close to the North and South poles. In fact, what to call a moment in time is arbitrary so nations adopt calibrations (setting of clock times) to suit the lifestyles of citizens. For example, the same moment in time is read as 7:35pm in New Zealand, 5:35pm in Melbourne, Australia, and 6:35am in England, since in summer NZ is on daylight saving time. In this unit students learn that clock time varies around the world.
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