Lines of Latitude and Longitude – PowerPointYaryalitsa
PowerPoint on Lines of Latitude, Lines of Longitude, Climate Zones, Equinoxes, Solstices, The Three Norths, Prime Meridian, International Date Line, Greenwich Mean Time, Coordinated Universal Time.
Lines of Latitude and Longitude – Worksheet at:
http://www.slideshare.net/yaryalitsa/lines-of-latitude-and-longitude-worksheet
Lines of Latitude and Longitude – PowerPointYaryalitsa
PowerPoint on Lines of Latitude, Lines of Longitude, Climate Zones, Equinoxes, Solstices, The Three Norths, Prime Meridian, International Date Line, Greenwich Mean Time, Coordinated Universal Time.
Lines of Latitude and Longitude – Worksheet at:
http://www.slideshare.net/yaryalitsa/lines-of-latitude-and-longitude-worksheet
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes.
The International Date Line (IDL) is an imaginary line of demarcation on the surface of the Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next.
This is slide show created based on a tutorial hosted by Geography World and created by Mr. Bowerman. All credit for images and information go to them. I created this for use in a 4/5 grade gifted social studies and math lesson.
A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes.
The International Date Line (IDL) is an imaginary line of demarcation on the surface of the Earth that runs from the North Pole to the South Pole and demarcates the change of one calendar day to the next.
This is slide show created based on a tutorial hosted by Geography World and created by Mr. Bowerman. All credit for images and information go to them. I created this for use in a 4/5 grade gifted social studies and math lesson.
6th std Social Science- Geography ch- 2 Latitudes and LongitudesNavya Rai
6th std Social Science- Geography ch- 2 Latitudes and Longitudes
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2. The Geographic Grid
• The network of parallels of
latitudes and meridians of longitudes
drawn on a map or a globe is called
the Geographic Grid.
• The intersection of latitude and
longitude at right angle points out the
exact position of a place on the
Earth’s surface.
• There are two reference lines called the equator and the prime
meridian, both of which are imaginary lines adopted uniformly by
all the countries to avoid confusion.
3. Latitudes
A latitude is an angular
distance of a place north or
south of the equator.
The equator is the imaginary
great Circle also known
as the 0⁰ latitude.
It divides earth into northern and southern hemisphere.
• Places north of the equator lies in the northern hemisphere and
are represented as (⁰N).
• Places south of the equator lies in the southern hemisphere and
are represented as (⁰S).
5. Latitude
North Pole
South Pole
Lines of
latitude are
numbered
from 0° at the
equator to
90° N.L. at the
North Pole.
Lines of
latitude are
numbered
from 0° at
the equator
to 90° S.L. at
the South
Pole.
]
[
90 80
70
60
50
40
20
30
10
90
80
70
60
50
40
20
10
30
6. Latitude
The North Pole
is at 90° N
The South Pole
is at 90° S
The equator is
at 0° latitude.
It is neither
north nor
south. It is at
the center
between
north and
south.
40° N is the 40°
line of latitude
north of the
equator.
40° S is the 40° line
of latitude south
of the equator.
7. Important Parallels Of Latitude
1. The Equator (0⁰)
2. The Tropic of Cancer (23.5⁰N)
3. The Tropic of Capricorn (23.5⁰S)
4. The Arctic Circle (66.5⁰N)
5. The Antarctic Circle (66.5⁰S)
8. Meridians Of Longitude
• The lines of longitude
are imaginary lines,
which join all the places
having the same angular
distance east or west of
the prime meridian.
The Greenwich meridian
or the prime meridian is the
reference line for measuring east-
westward distance of the earth.
• Prime meridian is taken as 0⁰
meridean.
9. Prime Meridian
The Prime Meridian (0°) and the 180° line split the earth
into the Western Hemisphere and Eastern Hemisphere.
Prime Meridian
Western
Hemisphere
Eastern
Hemisphere
Places located east of the Prime Meridian have an east longitude
(E) address. Places located west of the Prime Meridian have a
west longitude (W) address.
10. Longitude
• Lines of Longitude run vertically.
• They are also called Meridians.
• The Prime Meridian is found in Greenwich,
England.
• The Prime Meridian is 0 degrees Longitude.
• Lines of Longitude locate places East or
West of the Prime Meridian.
• There are 180 degrees of east Longitude,
and 180 degrees of west Longitude.
11.
12. Longitude
Lines of longitude begin
at the Prime Meridian.
60° W is the
60° line of
longitude west
of the Prime
Meridian.
The Prime Meridian is located at 0°. It is neither
east or west
60° E is the
60° line of
longitude
east of the
Prime
Meridian.
W E
13. LONGITUDE AND TIME
• The world rotates (spins) 360° in 24 hours.
360° / 24 hours = 15° per hour
• The world has 24 time zones, each l5° apart.
THERE IS A 1 HOUR TIME DIFFERENCE FOR EVERY
15° OF LONGITUDE
• Time zones are broad strips that measure 15 degrees wide.
• Time zones differ from their neighboring time zones by 1 hour.
• The lines of longitudes are used to find the time of any place.
14. • The earth takes 24 hrs to complete one rotation of 360⁰. This
gives rise to a time difference of [(24*60)/ 360] = 4min for one
degree of longitude.
• Therefore ,
1. A time difference of four min has to be added for each 1⁰ of
longitude towards the east.
2. A time difference of four min has to be subtracted for each 1⁰ of
longitude towards west.
Local time:
the time of a place recognized by the mid-day sun is called the loca’
time. All the places located along a particular longitude (from
north pole to south pole) face the overhead sun at the same
time.
15. Standard Time:
The local time of the central meridian is taken as the standard
time for the whole country or a large area.
• A large area may be crossed by many meridians of longitude,
it means they may have many local times. It would be very
difficult for people to keep on setting their watches according
to local time of the place.
• To avoid such difficulties and confusion, the local time of a
central meridian is taken as the standard time for the whole
country or a large area.
Indian Standard Time (I.S.T.):
The 82.5⁰ E longitude is selected as the central meridian of India
which passes through Prayagraj and is known as the standard
meridian of India.
16. Greenwich Mean Time:
• The local time of the Greenwich meridian also known as the
prime meridian is considered as the standard time for the
whole world is called the Greenwich Mean Time or G.M.T.
• All the countries for international travel follow it.
Time zones:
• Some countries like Russia, Canada, and USA have large
longitudinal extension where if a single time is followed as
standard time, it will create lot of problems.
• So to avoid such confusion, the countries having large east-
west extension have to follow more than one time zones. For
example , Canada and USA have 6 time zones.
18. International date line
• The international date-line, fixed
by international agreement, is an
imaginary line along the 180⁰ meridian
extending from north pole to south
Pole.
• International date line roughly
follows 180⁰ longitude and is not a
straight line.
-because few countries and islands are
located very close to 180⁰ longitude. To
keep them wholly on the same side ,
the international dateline goes zigzag
way, passing over seas and oceans only.
19. The Great Circle
• If the earth is divided exactly
into two halves by a circle with that
of the earth’s centre, simultaneo-
-usly the radius of the circle should
also be equal to that of the earth’s
radius, it is called great circle.
• The Equator is the greatest
possible circle as the earth is bulged at the equator representing
the circumference of the earth.
• In case of longitudes, we find that any longitude along with its
diametrically opposite longitude makes a full circle. So all
meridians of longitudes are considered to be great circle.
20. Importance Of The Great Circle
• The shortest route between any two places on the earth is always
prefered by the navigators and aviators. A route along the arc of a
great circle provides the shortest possible route which saves fuel,
time, and expenditure.
• There are special great circle charts used by the navigators on
which these routes are shown as straight lines. As far as possible,
the ships and aircrafts follow these routes to make their journey
economical.
• Sometimes, some countries do not allow the aircrafts to fly over
their airspace, so the aircrafts have to deviates from these routes.