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Unit 7 Calculations of world times when travelling between countries 1. Calculating arrival, departure and flying time 1.1 Determining the time and day in a different timezone Step 1: Locate the place for which you already know the time and day on a timezone map. Step 2: Locate the place for which you wish to know the time and the day of the week on a timezone map. Step 3: Count the time zones between the two places Step 4: Calculate the time by either adding or subtracting
an hour for each timezone, depending on whether you are moving east or west. Step 5: If you have crossed the International Date Line, identify the day.
1.2 Calculating arrival, departure and flying time Time difference calculations are also important when calculating arrival, departure, and flying times.
1.3 Calculating time using DST When DST applies to countries one has to add an hour to the timezone for countries to the east and subtract an hour for countries to the west.
2. Jet lag and jet fatigue 2.1 Definition of jet lag Jet lag is a general feeling of fatigue and disorientation often experienced by travellers by jet aircraft who cross several time zones in relatively few hours.
2.2 Symptoms of jet lag The main cause of jet lag is the inability of the body to immediately adjust to the time in a different zone. Other factors that contribute to jet lag are
• The food and drinks consumed during the flight
•
Cabin pressure, which causes leg swelling and tiredness
• Stale air in the plane, which cause tiredness,
irritability and headaches • Lack of exercise during the flight
• Lack of sleep during the flight.
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