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India's Eye in the Sky

How a Satellite Helps Us Understand and Protect Our Earth

Look up at the sky on a clear night. We see the Moon, stars and perhaps a few moving points of light. Some of those moving points may be satellites travelling around our planet.

But have you ever wondered what these satellites are doing up there?

Some help us communicate across continents. Some guide aircraft and ships. Some study distant planets. And some quietly watch our own Earth, collecting information that can help us protect it.

India has taken an important step in this direction with its Earth Observation Satellite, EOS-05, also known as GISAT-1A.

Launched by ISRO on 4 September 2026 aboard the GSLV-F17 rocket, EOS-05 is India's first Earth-imaging satellite designed to operate from geosynchronous orbit.

It is truly an eye in the sky!

1. What does an Earth observation satellite do?

Imagine looking at India from a very high mountain. You could see rivers, forests, fields, cities, coastlines and mountains.

Now imagine having a camera that can observe large regions of the Earth from space, repeatedly, without having to travel anywhere.

That is broadly what an Earth observation satellite does.

It collects images and other information about our planet. Scientists study these observations to understand changes taking place on land, in water and in the atmosphere.

The satellite does not simply take photographs for us to admire. Its observations can become useful information for people making important decisions.

2. Why is EOS-05 special?

Most Earth observation satellites travel in lower orbits and pass over different parts of the Earth as they move.

EOS-05 is different.

It operates from a much higher geosynchronous orbit, approximately 36,000 kilometres above Earth.

A satellite in this kind of orbit takes approximately 24 hours to complete one revolution around our planet. Its movement is synchronised with Earth's rotation, allowing it to observe a broad region repeatedly.

Think of it as a watchtower in space!

This is especially useful when scientists need frequent observations of the same region.

EOS-05 carries imaging instruments that work in visible and infrared regions of the electromagnetic spectrum. These help it gather information that ordinary human eyes cannot see.

3. How can it help ordinary people?

The real value of a satellite is not merely how far it travels or how sophisticated its instruments are. It is what we can do with the information it brings back.

For farmers

Satellite observations can help monitor agricultural land, crop conditions and changes in vegetation. Such information can support crop assessment and agricultural planning.

During floods and cyclones

When heavy rainfall causes rivers to overflow, satellite images can help authorities understand which areas are affected and how the situation is changing.

This information can support rescue planning and disaster management.

For forests and wildlife

Observations from space help scientists monitor forest cover, environmental changes and the condition of natural habitats.

For our rivers and coastlines

Satellite information can help study riverbank erosion, freshwater resources and changes along coastal regions.

For towns and cities

As cities grow, satellite images can help planners understand how land is being used and where roads, bridges and other infrastructure may be needed.

One satellite cannot solve all these problems. But the information it provides can help thousands of people working on the ground.

4. How does a satellite send information to Earth?

Have you wondered how photographs taken thousands of kilometres above us reach scientists on Earth?

The satellite uses radio communication systems to transmit the collected information to ground stations.

Computers and specialised software then process the data and turn it into useful images and maps.

Scientists study these images, compare them with earlier observations and look for changes.

A green patch may indicate vegetation. A change in the appearance of a river may reveal flooding or erosion. Differences in infrared observations can provide information about land and vegetation conditions.

What begins as a signal travelling through space becomes information that can help people on Earth.

5. Who makes all this possible?

Behind every satellite is the work of thousands of scientists, engineers, technicians and other professionals.

The rocket must be designed to carry the satellite safely into space. The satellite must withstand extreme conditions. Its instruments must function accurately. Ground stations must receive the information, and scientists must interpret it.

It is a remarkable example of teamwork.

India's space programme, led by ISRO, has steadily developed capabilities in satellite communication, navigation, weather observation and Earth imaging.

EOS-05 adds another important capability to this growing programme.

6. The bigger lesson

We often imagine space exploration as something distant from our everyday lives.

We think of astronauts, rockets, the Moon and Mars.

But some of the most valuable discoveries made possible by space technology are about the planet beneath our feet.

A satellite may help us understand why a forest is shrinking, how a river is changing, where crops are under stress or which regions need attention after a natural disaster.

It reminds us that protecting Earth requires us to understand Earth first.

And perhaps that is the most beautiful thought behind India's Eye in the Sky.

We look towards space, not merely to discover what lies beyond our planet, but also to take better care of the home we already have.