NCERT-GEOGRAPHY-CLASS-06-CHAPTER-01
👉NCERT-भूगोल-कक्षा-06- अध्याय-01
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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
- By studying the above diagram when we have moon in middle of Sun and Earth causing the night on earth without the moon.
- 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
- which is observable,
- with a definite mass -&- structure
- high density to solidness
- round in shape is called the celestial body.
Star
- Which has its own heat and light known star.
- Our sun is a star.
- Which gets its heat and light from nuclear fusion.
Constellations
- A group of stars forming "definite positioned patterns" of stars in space is known as constellations.
Ursa Major or Big Bear
- It is the name of one of the constellations.
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
- A definite composition in which we have our
- son
- 8 planets
- satellites
- belt of asteroids
- meteoroids
- comets and
- 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
- size and
- 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?
- Solid surface
- Temperature
- Water and
- Air is the primary component for sustaining life. On the earth, these elements are in a proportional manner that's why we have-
- not too much hot or too much cold temperature,
- availability of freshwater along with saline water, and
- the presence of oxygen in the air.
Satellite
- A celestial body that
- does a revolution around the planet
- In a definite orbit is known as a satellite.
- 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.
- Between the mass and Jupiter planet, we have a narrow belt of celestial bodies of different shapes and sizes known as asteroids.
- 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
- Aryabhatt was the great Indian astronomer who, in the 5th century, by studying the celestial body, declared that the
- Earth does revolution around the sun.
- That is the sun at the center of the solar system.
👉Upcoming Chapters 👀
Milky Way galaxy -&- Akash Ganga
- A 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.
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