module 1 - science 7

1. LOCATING PLACES ON EARTH
PREPARED BY: TYPE YOUR NAME HERE

2. Demonstrate how places
on Earth may be located
using a coordinate system
S7ES - IVa - 1

3. GPS
Global Positioning System

4. How it works?
 GPS satellites circle the earth twice a day
in a very precise orbit and transmit
signal information to earth. GPS
receivers take this information and use
trilateration to calculate the user's exact
location.
trilateration is the process of determining
absolute or relative locations of points by
measurement of distances, using the geometry
of circles, spheres or triangles.

6.  A GPS receiver must be locked on to
the signal of at least 3 satellites to
calculate a 2-D position (latitude and
longitude) and track movement.
Once the user's position has been
determined, the GPS unit can
calculate other information, such as
speed, bearing, track, trip distance,
distance to destination, sunrise and
sunset time and more

9. USING GOOGLE EARTH

10. GOOGLE EARTH
 3D mapping program from Google
that covers the entire globe from
satellite images
 Requiring a download for Windows,
Mac and Linux desktops, a street
address can be searched, and the
views can be zoomed down to the
individual building all the way up to a
satellite's view of the globe

15. USING LATITUDE AND LONGITUDE

16. Any location on Earth is described by
two numbers--its latitude and its
longitude. If a captain of a plane wants
to specify position on a map, these are
the “coordinates” they would use.

17. LONGITUDE AND LATITUDE
these are two angles
measured in degrees,
“minutes of arc” and “seconds
of arc”
These are denoted by the
symbol ( º, ' , '' )
 Example: 35º 43 ' 9 ''

18. LATITUDE
 lines that go EAST and WEST
 also known as PARALLELS
 best known parallel of latitude is
the EQUATOR
the Equator divides the Earth
into two equal parts.
HEMISPHERES

19. LATITUDE
measures distance north and south of the
Equator
numbered 0 to 90 º
As the number of the latitude becomes
higher, the farther it is from the Equator
In writing degrees of latitude, the word
“North” (N) or “SOUTH” (S) is added

20. EXAMPLE
 SEATTLE, WASHINGTON
47º NORTH
 LIMA, PERU
12º SOUTH

21. LONGITUDE
 term used for the lines found in the
east-west direction
 beginning line is at GREENWICH
(Great Britain)
PRIME MERIDIAN ( 0 º)
 In reading reading degrees
longitude, you add “EAST” (E) or
“WEST” (W)

22. LONGITUDE
MERIDIAN is the term used for the lines that
show longitude.
The Meridian of 180 degrees WEST is the
same as that of 180 degress EAST.
•Every meridian must cross the equator.
•since equator is a circle, it'll be divided
into 360 º and the longitude of a point is
then the marked value of a division
where its meridian meets the equator.

25. E, PM, IDL

27. INTERNATIONAL DATE LINE

28. INTERNATIONAL DATE LINE
 imaginary line of navigation on the surface of
the Earth that runs from north pole to the south
pole and demarcates the change of one
calendar day to the next
 found in the middle of the Pacific Ocean

29. IS IT A STRAIGHT LINE?
It runs from pole to pole mostly through
the Pacific Ocean but bends to the east
to include Siberia with Russia, and
bends to the West to include the
Aleutian Island with Alaska. It bends to
the East once more to keep all the Fiji
islands on one side of the line.

32. TIME ZONES

33. TIME ZONES
Time zones have irregular boundaries to
make alowance to political frontier.
Measured through 0ºlongitude

34. TIME ZONES
Because the Earth is divided
into 360º longitude and
completes a spin on its axis in
a day (24 hours), the time
alters by one hour for every
15ºof longitude.

36. QUIZ
 What is the latitude and
longitude of :
1. MEXICO CITY
2. LOS ANGELES, CALIFORNIA
3. KUALA LUMPUR, MALAYSIA
4. SYDNEY, AUTRALIA
5. MANILA, PHILIPPINES
6. BAGHDAD, IRAQ
7. DUBLIN, IRELAND
8. KAMPALA, UGANDA
9. PORT VILA, VANUATU
10. LIMA, PERU
 If it's 8:00 p.m. in the
Philippines, what time is it
in:
1. PARIS, FRANCE
2. TAIWAN
3. NEW YORK, USA
4. JAPAN
5. ARGENTINA

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