Geography Que-Ans: [5 Marks Each]

Information technology is a combination of many types of technology.

These include microelectronics, computer communications broadcasting and optic electronic.

Information and communication of new fields in technology is more important than the usefulness of information technology.

With the advent of the internet the whole world has turned into a global village.

Today, through any convenient system, any experiment can be connected to cyberspace through the medium of micro computer and modem.

Can get the latest information of various kinds related to it.

Cyber ​​electronics is the world of the computerized realm, communicated by technologies such as the Internet and the World Wide Web.

India has made great strides in the field of remote sensing satellites.

Including a series of $IRS$ satellites.

The use of satellite communications services has made mapping more and easier and more accurate.

As a result of joint ventures of satellite, computer, internet, etc., we now have modern methods of mapping. In which..

Geospatial System $(GPS).$

Geographic Information System $(GIS).$

Space Information Technology $(SIT).$

In addition, due to the technology of remote sensing, mobile mapping, satellite imagery, etc., the science of maps has become a specialized science.

Get acquainted $($gain, obtain$)$ with present-day techniques of mapping.

Global Positioning System:

Radio is an all-season radio navigation system. This system has been developed by the $USA$ Army.

A total of $24$ satellites orbiting the earth have been kept continuously operational in this system.

Information indicator radio waves are sent from each satellite.

Which are called signals.

These signals are detected on land-based land-control centers.

In this the person himself can see the image of the installation of the earth at that time on the computer.

He can easily plan his work based on it. The device clearly indicates the height of the place above the sea level, due to the innovative technology of this device; it has become possible to use it in everything from automobiles to mobiles.

He truly plays a role as a hero.

The time and place of $BRTS$ in Ahmadabad is also managed by this technical system.

Standard time:

Locations on different longitudes vary in local time.

Therefore, if villages, cities, metropolises, etc. on different longitudes in any country deal with their respective local times, then there are many difficulties in road, rail, air travel, commercial activity, communication, etc.

To overcome this difficulty each country usually determines the local time of the longitude passing through its medium as the normal time of the whole country.

It is called the proportional time of that country and it is called the proportional equator

The time line says.

India's standard time is determined from $82.30$ degrees east longitude passing through the center of the country.

However, no large and well-known city in India is located on this longitude.

It is bordered by Allahabad to the west and Varanasi to the east.

India Standard Time:

In general, due to the longitudinal extent of India, the time of sunrise in Arunachal Pradesh and Gujarat also changes.

Arunachal Pradesh is located in the east of Gujarat.

So there will be a sunrise first.

Due to the difference of about $30^\circ$ degrees longitude between the end destinations of Gujarat and Arunachal Pradesh, there is a difference of about two hours in the local time.

Because one longitude from the sun to the earth passes in $4$ minutes.

So when the sun rises in Arunachal Pradesh, there is still night left in Kutch, which means the sunrise in the northeastern states is about two hours earlier than in Kutch.

This time difference is accepted as the local time of $82.30^\circ$ degrees east longitude as "Indian Standard Time".

Which is $5$ hours $30$ minutes ahead of Greenwich Mean Time.

Due to this, the clocks in Dibrugarh in the east, Imphal, Lohit in the west, Bhopal in central India and Chennai in the south show the same clock.

It does not pass through Allahabad $(81.55$ east longitude$).$

The $180^\circ$ degree longitude is called the international longitude line.

This line is raised or lowered.

The east-west spread of countries like $USA,$ Canada, and Russia etc. is much higher.

If their time is determined from the longitude passing through the medium of this country, then the local time of some cities or villages varies by $4$ to $5$ hours.

In Russia this difference can be up to $12$ hours.

Therefore one more time belt has been fixed in countries with such east-west expansion.

There are five time belts in the $USA$ and Canada, eleven in Russia, three in Europe, and three in Australia.

There is no difference of more than one hour between each timetable.