2 SST LONGITUDES AND LATITUDES Flashcards
Define “Globe”
A globe is a miniature model of the earth.
Who is a navigator?
A person who finds the position of a ship and the direction in which it should go.
Define “Axis of the Earth”.
Axis is an imaginary line passing through the Centre of the Earth. The Earth spins about this line.
Which line meets the Earth’s Surface at only two points. Name the line and the points.
Axis
The North Pole and the South Pole.
Define “Equator”
The Equator is an imaginary line that divides the earth into two halves (Northern and Southern Hemisphere) and passes between the two poles.
The region between the Equator and the South Pole is called_______________.
Southern Hemisphere
The region between the Equator and the North Pole is called__________.
Northern Hemispshere
Define “Latitudes”
Imaginary circular lines drawn parallel to the equator are called latitudes. These lines are drawn north or south of the Equator from east to west.
What do Latitudes tell us?
Latitudes tell us the location of a person or thing between the Equator and the North Pose/South Pole.
How are the Latitudes measured?
latitudes are measured in degrees i.e. 10N or 900S.
How many latitudes are there?
There are 90 latitudes drawn between Equator and North Pole and 90 latitudes between the Equator and South Pole.
Thus, there are 181 latitudes including Equator.
What is the measurement of Equator in degrees?
00
Zero Degree
Which latitude covers the maximum and minimum distance?
As we go north or south of the Equator, the circles or latitudes becomes smaller.
The Equator is the biggest circle hence covers the maximum distance.
North Pole (900N) and South Pole (900S) are not circles but simply dots hence covers zero distance.
What is the measurement of Tropic of Cancer?
23 1/2 0 N
What is the measurement of Tropic of Capricorn?
23 1/2 0 S
What is the measurement of Arctic Circle?
66 1/2 0 N
What is the measurement of Antarctic Circle?
66 1/2 0 S
What is the measurement of North Pole?
900N
What is the measurement of South Pole?
900 S
Define Longitudes
The vertical imaginary lines running from the North Pole to the South Pole are called Meridians of Longitudes or simply longitudes.
Define the North Pole
The North Pole is the northernmost point on Earth.
Define south Pole.
South Pole is the southernmost point on Earth.
How many longitudes are there?
There are 360 longitudes.
Which longitude is called as Prime Meridian?
The 00 longitude has been named as the Prime Meridian.
Which imaginary line divides Earth into two equal halves i.e. Eastern Hemisphere and the Western Hemisphere.
Prime Meridian
How many lines of longitudes fall in the Western Hemisphere?
180 lines.
From 10 W to 1800W.
How many longitudes fall in the Eastern hemisphere?
180 lines.
10E to 1800E.
Which longitude is termed as international Dateline?
1800E and 1800W refer to the same longitude and is simply called as 1800 with the letter E or W. At about 1800 longitudes fall a line called the International Dateline.
Which of the following lines runs parallel to each other?
Longitudes
Latitudes
Latitudes
The distance between two longitudes is the greatest at the _________. Why?
Equator being the largest circle.
At what angles, longitudes cross latitudes?
900
What is the geographical Grid?
The network of latitudes and longitudes is called a Geographical Grid.
It helps in locating points on a map or globe.
The main use of the grid of Meridians and parallel is to
Tell time
Locate places
Check latitudes of places
Locate places
How will you calculate the time difference between two longitudes?
Earth takes 24 hours (1440 minutes) to complete one rotation i.e. 360 longitudes.
1440÷360 = 4
Therefore, it takes 4 minutes to rotate one degree of longitude. The time difference between two longitudes is 4 minutes.
Which of the following helps in finding the time of a place.
Latitude
Longitude
Longitude
On which Meridian of longitude, a calendar day starts and ends.
1800 longitude (International date line)
What happens if the international date line passes through an island or some landmass?
How is it corrected?
The International dateline has not been kept straight.
If, it passes through an island or some landmass, there will be two dates on that place. To avoid such confusion, the international dateline is adjusted to either include or exclude the countries.
What is the direction of rotation of the Earth?
Earth rotates from West to East.
Places on the east will have midday before the places on the west.
Which of the following will have midday first.
Places on the west
Places on the east
Places on the east.
How the midday of a place is calculated?
When the sun shines directly overhead on a longitude, it is midday on all places on that longitude.
What adjustment a does traveler need to make when he is stepping across the International Dateline from the east to the west?
The traveler steps forward a day. He needs to change the next date.
If a traveler crosses the line on 1st Oct, he needs to change the date to 2 October.
What adjustment a does traveler need to make when he is stepping across the international date line from the Wests to east?
The traveler steps into the previous day.
He needs to change the date to the previous day. If a traveler crosses the line on 2 October, he needs to change the date to 1st October.
