Latitude and Longitude are used to determine locations on Earth
The highest number of Hong Kong residents departing from Hong Kong International Airport are in April, July, and December due to long holidays like Easter, summer holiday, and Christmas, which are peak seasons for traveling
Important longitudes
0°– the Prime Meridian: It passes through Greenwich in London
180°E/W – the basis of the International Date Line
The world is divided into different time zones
There are 24 time zones in the world with the local time at the Prime Meridian being the international standard time, normally 8 hours behind Hong Kong local time
International date line can lead to forward or backward one day
The time zone where Greenwich is located is known as Greenwich Mean Time (GMT) and has no offset from UTC (i.e. UTC+00:00)
Important latitudes
90°N – the North Pole (a point)
66.5°N – the Arctic Circle
23.5°N – the Tropic of Cancer
0°– the Equator
23.5°S – the Tropic of Capricorn
66.5°S – the Antarctic Circle
90°S – the South Pole (a point)
Calculating time difference between two cities
1. Find out the time zone of City A
2. Find out the time zone of City B
3. Find out the time difference between the two cities
4. Find out the time in City A
5. Calculate the time in City B
Additional exercise example: Hong Kong time 6:00am on Jan 1, Local time in Moscow:
Reduced Bearing formats
Always start with N or S followed by a degree and then E or W, e.g. N15oE, S65oW, W25oN
Compass Points
N
S
E
W
NE
SE
NW
SW
SSW
WSW
WNW
NNW
NNE
ENE
ESE
SSE
Daylight Saving Time is the practice of moving the clock forward for one hour during summer months
Effects of Daylight Saving Time
Without DST: Sunrise at 4am, Sunset at 8pm
With DST: Sunrise at 5am, Sunset at 9pm
There are 360 degrees in a compass circle which can be divided into 4 equal sections, each having 90 degrees
Direction can be found using a compass
DaylightSavingTime is also known as “Summer time”
Whole-circle Bearing shows direction in degrees of a circle