Social Studies Notes Pre-9th – Complete Notes

Chapter # 4 – Introduction to Geography

4.1.2locate Equator, Prime Meridian, Tropic of Cancer, Tropic of Capricorn,
Arctic Circle, Antarctic Circle, longitudes, and latitudes on the globe;

Equator

The Equator is an imaginary line that divides the Earth into the Northern Hemisphere and the Southern Hemisphere. It is located at 0° latitude and is the longest line of latitude on the globe. The Equator receives the most direct sunlight throughout the year and serves as the starting point for measuring latitude.

Prime Meridian

The Prime Meridian is an imaginary line that runs from the North Pole to the South Pole. It is located at 0° longitude and divides the Earth into the Eastern Hemisphere and the Western Hemisphere. The Prime Meridian passes through Greenwich, England, and is the starting point for measuring longitude.

Longitudes

Longitudes are imaginary lines that run from the North Pole to the South Pole. They are measured in degrees east or west of the Prime Meridian. Longitudes help determine the east-west position of places on the Earth and are used to calculate time zones.

Latitudes

Latitudes are imaginary lines that run parallel to the Equator. They are measured in degrees north or south of the Equator. Latitudes help determine the north-south position of places on the Earth and are important for studying climate and weather patterns.

Tropic of Cancer

The Tropic of Cancer is an imaginary line of latitude located at 23.5° North of the Equator. It marks the northernmost point where the Sun can appear directly overhead at noon. The Tropic of Cancer passes through several countries, including Pakistan.

Tropic of Capricorn

The Tropic of Capricorn is an imaginary line of latitude located at 23.5° South of the Equator. It marks the southernmost point where the Sun can appear directly overhead at noon. It passes through parts of South America, Africa, and Australia.

Arctic Circle

The Arctic Circle is an imaginary line of latitude located at 66.5° North of the Equator. It marks the southern boundary of the Arctic region. Areas within the Arctic Circle experience very long days in summer and very long nights in winter.

Antarctic Circle

The Antarctic Circle is an imaginary line of latitude located at 66.5° South of the Equator. It marks the northern boundary of the Antarctic region. Areas within the Antarctic Circle experience extreme seasonal variations in daylight and contain the continent of Antarctica.

Why are Latitudes and Longitudes Important?

Finding Locations

They help identify the exact location of places on Earth.

Navigation

Pilots, sailors, and travelers use them for navigation.

Climate Study

Latitudes help explain differences in climate and temperature.

Time Zones

Longitudes help determine local time around the world.

Key Terms

Facts to Remember

The Equator is located at 0° latitude.

It divides the Earth into Northern and Southern Hemispheres.

The Prime Meridian is located at 0° longitude.

It divides the Earth into Eastern and Western Hemispheres.

Latitudes run east to west.

They are parallel to the Equator.

Longitudes run from pole to pole.

They meet at the North and South Poles.

The Tropic of Cancer is at 23.5° North.

It passes through Pakistan.

The Arctic and Antarctic Circles are located at 66.5° latitude.

They mark the boundaries of the polar regions.

Summary

Latitudes and longitudes are imaginary lines used to locate places on Earth. The Equator (0° latitude) divides the Earth into Northern and Southern Hemispheres, while the Prime Meridian (0° longitude) divides it into Eastern and Western Hemispheres. Other important lines include the Tropic of Cancer, Tropic of Capricorn, Arctic Circle, and Antarctic Circle. These lines help geographers study location, climate, navigation, and time zones.