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The notes for Locating Places on the Earth cover every section of the official NCERT chapter — definitions, key concepts, formulas, derivations, and worked examples — written for Class 6 Social Science students.

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Locating Places on the Earth Class 6 Social Science Notes

Social Science helps us understand the complex world we live in, especially in the challenging 21st century. It aims to answer fundamental questions about how humanity can solve problems, live in peace, and protect our planet. While it uses scientific methods, its focus on diverse human societies means it doesn't always produce fixed results like physics or chemistry.

Social Science includes many specialized areas called subdisciplines, such as geography, history, political science, economics, sociology, anthropology, archaeology, and psychology. For students in the Middle Stage, these are grouped into five broad themes to make learning more accessible.

One of these themes, Theme A - India and the World: Land and the People, is particularly important for understanding our geographical world. It explores the main features of our planet and how to represent them on a map. This theme explains how geographical features like oceans, mountains, and rivers have shaped entire civilisations throughout history, and how India's natural setting has given its ancient civilisation a unique identity.

Social Science is essentially about asking the right questions to find answers that help us understand the present and prepare for a better future. It often combines elements from diverse fields, a concept known as multidisciplinarity, to enrich our perspective, much like life itself constantly mixes numerous elements.

Locating Places on the Earth

Understanding how to locate places is a fundamental aspect of geography. As the ancient Indian astronomer Āryabhaṭa noted around 500 CE, Earth is a spherical body in space, made of water, earth, fire, and air, and is surrounded by all creatures.

What is a Map and How Do We Use It?

A map is a representation or drawing of an area, viewed as if you are looking down from the top. It can depict a small area like a village, a larger area like a district or state, or even the entire world. Maps are essential tools, much like a treasure guide, showing where things are and how to get to them. A collection of maps bound together is called an atlas.

There are several kinds of maps, each designed to show different types of information:

Physical maps: These mainly show natural features such as mountains, oceans, and rivers.
Political maps: These display details of countries, states, boundaries, and cities.
Thematic maps: These focus on specific kinds of information, such as rainfall distribution or population density.

Components of a Map

Every map relies on three important components:

Distance: Maps represent large distances on a small piece of paper using a scale. The scale tells you the ratio between the distance on the map and the actual distance on the ground. [!example] If a map has a scale of 1 cm = 500 m, it means that every one centimeter measured on the map represents 500 meters in the real world. This allows us to calculate actual distances.
Direction: Maps use specific directions to help us navigate. The four main or cardinal directions are North, East, South, and West. North is typically at the top of a map. Between these, we have intermediate directions like Northeast (NE), Southeast (SE), Southwest (SW), and Northwest (NW). Most maps include an arrow marked with 'N' to indicate the North direction.
Symbols: To show numerous details in the limited space of a map, mapmakers use symbols instead of drawing actual buildings or features. These small drawings or icons represent different kinds of buildings (like a railway station, school, or post office), roads, railway lines, and natural elements (like a river, pond, or forest). To ensure maps are easily understood globally, mapmakers use specific, often standardized, symbols. In India, the Survey of India, a government body, sets the standard symbols for maps.

Mapping the Earth with a Globe

Representing the Earth accurately on a flat map is challenging because our planet is nearly spherical. Just as you cannot flatten an orange peel without tearing it, you cannot flatten the Earth's surface perfectly onto a two-dimensional map without some distortion.

A globe is a spherical model of the Earth. Because it shares the same spherical shape as the Earth, a globe provides a much better and more accurate representation of the Earth's geography compared to a flat map.

Understanding Coordinates

To precisely locate any place on Earth, a system of coordinates is used. This system works much like giving directions in a market (e.g., "7th shop in the 5th row") or marking squares on a chessboard (e.g., "d4"). These two pieces of information, or coordinates, allow for exact location identification.

Latitudes

On a globe, we can easily identify the North Pole and the South Pole. Halfway between them lies the Equator, which is a large imaginary circle around the Earth.

Latitude is a measure of the distance of a place from the Equator. If you travel from the Equator towards either pole, your distance from the Equator increases. An imaginary line drawn east and west, parallel to the Equator, is called a parallel of latitude. These parallels form circles around the Earth; the Equator is the largest circle, and the circles become smaller as they move northward or southward towards the poles.

Latitudes are expressed in degrees:

The Equator is defined as 0° latitude.
The North Pole is 90° North (90°N).
The South Pole is 90° South (90°S).

Note

There is a direct connection between latitude and climate.

Areas around the Equator (low latitudes) generally have a hot, or torrid, climate.
As you move away from the Equator towards the poles (increasing latitude), the climate becomes more moderate, or temperate.
Regions closer to the North or South Pole (high latitudes) experience colder, or frigid, climates.

Longitudes

Meridians of longitude are imaginary half-circles that run from the North Pole to the South Pole. Unlike parallels of latitude, all meridians of longitude are of the same length.

The Earth spins on its axis from west to east. This rotation causes different places on Earth to experience morning, mid-day, evening, or night at different times. This means that by measuring the longitude of a place, we can also determine the time at that location.

To measure longitudes, a reference point called the Prime Meridian is defined. In 1884, nations decided that the meridian passing through Greenwich, an area of London in England, would be the international standard for the Prime Meridian. It is marked as 0° longitude and is also known as the Greenwich Meridian.

Longitude is a measure of the distance of a place from the Prime Meridian, measured along the Equator. It is also expressed in degrees, increasing from 0° up to 180° eastward (E) or westward (W). For example, Delhi's longitude is approximately 77°E. The 180°W and 180°E longitudes refer to the same line, simply noted as 180°.

Note

Together, latitude and longitude form the two coordinates of a place. This grid of imaginary lines (parallels of latitude and meridians of longitude) allows us to precisely locate any place on Earth. For instance, Delhi is located at approximately 29°N latitude and 77°E longitude.

The Prime Meridian divides the Earth into the Western Hemisphere and the Eastern Hemisphere, while the Equator divides it into the Northern Hemisphere and the Southern Hemisphere.

Example

Centuries before the Greenwich Meridian was established, ancient India had its own prime meridian, called madhya rekhā (meaning 'middle line'). This meridian passed through the city of Ujjayinī (modern-day Ujjain), a renowned center for astronomy. Famous astronomer Varāhamihira lived and worked there around 1,500 years ago. Indian astronomers were aware of latitude and longitude concepts, and the Ujjayinī meridian served as a reference for astronomical calculations.

India's geographical extent spans approximately from 8°N to 37°N latitude and from 68°E to 97°E longitude.

Understanding Time Zones

The Earth completes a full rotation of 360° on its axis every 24 hours. This means it rotates 15° every hour ( $360° / 24 = 15°$ ). This rotation is the basis for understanding time differences across the globe.

As the Earth rotates eastward, locations to the east of a meridian experience sunrise earlier. For every 15° of longitude moved eastward, the local time advances by one hour. Conversely, for every 15° of longitude moved westward, the local time goes back by one hour. [!example] If it is 12 pm (noon) at the Greenwich Meridian (0°), it will be 1 pm local time at 15°E longitude and 11 am local time at 15°W longitude.

While this method allows us to calculate the local time for any place, it would be highly inconvenient for a large country to use many different local times. Therefore, most countries adopt a standard time based on a central meridian passing through them.

India uses Indian Standard Time (IST), which is 5 hours and 30 minutes (5.5 hours) ahead of Greenwich Mean Time (GMT), the local time at Greenwich. [!example] Imagine two friends, one in Porbandar (Gujarat) and another in Tinsukia (Assam), speaking on the phone. If the friend in Assam says it's dark because the sun has set, while the friend in Gujarat still sees daylight, it's because Assam is further east and experiences sunrise and sunset earlier. The difference in longitude between these two regions is significant, leading to a noticeable difference in their local times. However, both places follow IST, which is a standardized time for the entire country.

These standard times are organized into time zones globally. Although these zones broadly follow the 15° longitude divisions, their boundaries are not perfectly straight lines on a world map. This is because time zone boundaries are often adjusted to respect international borders and ensure that countries or even parts of countries do not fall into different time zones. [!note] Some large countries, such as Russia, Canada, or the USA, are so wide that they encompass multiple time zones. Russia, for instance, has 11 time zones, meaning travelers crossing the country from east to west would need to adjust their watches multiple times.

The line of longitude approximately opposite the Prime Meridian, at 180° longitude, is called the International Date Line. When crossing this line, travelers must adjust their date:

Traveling eastward across the International Date Line means subtracting a day (e.g., from Monday to Sunday).
Traveling westward across the International Date Line means adding a day (e.g., from Sunday to Monday). The International Date Line deviates in places to avoid dividing countries into two different calendar days.

Key Takeaways

Maps are useful tools for representing areas of the Earth, showing distance, direction, and using symbols.
Every place on Earth can be precisely located using a grid of latitudes (imaginary lines parallel to the Equator, running east-west) and longitudes (imaginary lines running from pole to pole, north-south).
Longitude is also crucial for determining local time and defining time zones.
The International Date Line, located around 180° longitude, marks where the date changes by one day upon crossing.

Locating Places on the EarthClass 6 Social Science Notes

Introduction Why Social Science?