NCERT-GEOGRAPHY-CLASS-06-CHAPTER-01

 

👉First Study These Chapters 👀


👉NCERT-भूगोल-कक्षा-06- अध्याय-01

 👀



Poornima

  • When we see a full yellowish color moon in the sky.
  • Also known as the full moon. So that night is known as a full moon ( Poornima) night.            

Amavasya

  1. By studying the above diagram when we have moon in middle of Sun and Earth causing the night on earth without the moon. 
  2. That is complete darkness in the sky known as Amavasya or a new moon night.

New Moon Night

  • When we have Amavasya that night is called New moon night.
  • Because from the very next night, we start to see the moon with a very minor portion, and 
  • abs with upcoming nights illuminated portion of moon increases gradually which is to complete on the night of Poornima.

Celestial bodies


The matter in space -

  1. which is observable, 
  2. with a definite mass -&- structure 
  3. high density to solidness
  4. round in shape is called the celestial body.

Star



That celestial body -
  1. Which has its own heat and light known star. 
  2. Our sun is a star.
  3. Which gets its heat and light from nuclear fusion.
Note- The minimum temperature required to transform into to star is 01 Crore Degree Centigrade. 


Constellations

  • group of stars forming "definite positioned patterns" of stars in space is known as constellations. 

Ursa Major or Big Bear


Saptarishi

  • The Indian name was given to the constellation which is part of Ursa Major.

Pole star

  • The star in the sky which indicates the north direction is known as the North Star also known by the name "Pole star." 

Planets

  • That celestial body does not have its own heat and light and is illuminated by the light of the sun

Solar system

  • definite composition in which we have our 

  1. son 
  2. 8 planets 
  3. satellites 
  4. belt of asteroids 
  5. meteoroids 
  6. comets and 
  7. dust particles are known as the solar system.

Pulling force

  • The force by which the sun binds up altogether the solar system is known as the pulling force of his son.

Ultimate source of energy

  • Our sun, in our solar system, is the ultimate source of energy.

Orbit

  • By its pulling force sun binds us together with our solar system.
  • In this system, the planet does its revolution around the sun in a definite route with a definite time.
  • This route, which is elongated in shape, is known as orbit.
       


Earth twin

  • Venus is known to be the planet as earth's twin planet because of its 

  1.  size and 
  2.  the shape is very much identical to that of Earth. 
     

Pluto

  • Before 2006 Pluto was the ninth planet in our solar system.
  • In 2006 a meeting was held of the International Astronomical Union, headquarters in Paris, declaring Pluto no longer our planet and converting it into a dwarf planet.
       

Geoid

  • Earth's shape is not a spherical one but actually, it is flattened on its north pole and the South Pole & having a bulge in the middle.
  • So this flattened pole shape is known as a Geoid.


Blue planet

  • The three-fourth portion of our planet Earth is covered by water.
  • Because naturally, water has a blue colour that's why Earth is known as the blue planet.
      



The favorable conditions to support life on the earth?

  1. Solid surface
  2. Temperature 
  3. Water and 
  4. Air is the primary component for sustaining life. On the earth, these elements are in a proportional manner that's why we have-
     

  1. not too much hot or too much cold temperature, 
  2. availability of freshwater along with saline water, and
  3. the presence of oxygen in the air.

Satellite

  1.       A celestial body that 
  2.       does a revolution around the planet 
  3.        In a definite orbit is known as a satellite.
  4.        The moon is a satellite of our Earth.

The orbital period of the moon

  • The moon which is the natural satellite of the earth has 27 orbital periods. 
Asteroids

  1. Between the mass and Jupiter planet, we have a narrow belt of celestial bodies of different shapes and sizes known as asteroids.
  2. Asteroids in an orbit do the revolution of the Sun.
   


Meteor

  • In the solar system, we have celestial bodies, which do not have a fixed orbit, but, revolve around the sun known as meteoroids. 


Astronomers

  • The human beings who study space, celestial bodies, and their movements are called astronomers.

Aryabhatt

  1. Aryabhatt was the great Indian astronomer who, in the 5th century, by studying the celestial body, declared that the
  2. Earth does revolution around the sun.
  3. That is the sun at the center of the solar system. 

👉Upcoming Chapters 👀



Milky Way galaxy -&- Akash Ganga

  • cluster of stars, interstellar gas & matter in space is known as a galaxy.
  • In-universe we have thousands of galaxies.
  • Out of these in which galaxy our solar system is situated known as the Milky Way galaxy.
  • The Indian astronomers in ancient times called the Milky Way galaxy Akash Ganga.
     

👉 Look at this ALSO 👀

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