NCERT CLASS-6 GEOGRAPHY
CHAPTER-1 [ THE EARTH IN THE SOLAR SYSTEM]
- Full moon or Poornima appears only once about In a month’s time.
- A fortnight later, moon disappears, it is a New Moon night or Amavasya.
- The sun, the moon and all those objects shinning in the night asks are called CELESTIAL BODIES.
- Celestial bodies which are very big and hot, mads up of gases, emits their own Heat and light, are called stars.
- The sun is a star.
- Various patterns formed by different groups of stars are called CONSTELLATIONS. Ex, URSA MAJOR or BIG BEAR is one such constellation.
- Constellation Saptrishi (sapt- seven, Rishi- sages), group of 7 stars that forms a Part of Ursa Major Constellation.
- North Star indicates the North direction, also called Pole Star, remains in same position in the sky.
- We can locate pole star with the help of saptrishi.
- Celestial bodies that do not have their own heat and light, are called planets.
- The word ‘planet’ comes from Greek work ‘Planetai’ which means ‘wanderers’.
- Moon is a satellite of earth.
- Jupiter, Saturn and Uranus have rings around them.
- The sun, eight planets, satellites and some other celestial bodies known as asteroids and meteoroids from the solar system.
- The sun is about 150 million km away from the earth.
- Fixed paths on which planets move around the sun are called orbits.
- Mercury is the nearest to the sun, takes 88 days to complete one round along it orbit.
- Venus is considered as earth twins because it shape and size are very much similar to that of the earth.
- August 2006, meeting of the international astronomical union, decision taken that Pluto is a ‘ dwarf planet’. (Ceres, 2003 & UB313)
- Earth is the 5th largest planet, flattened at the poles, shape is described as GEOID. GEOID means earth like shape.
- ‘Sol’ in Roman mythology is the ‘sungod’.
- ‘Solar’ means related to the sun.
- Geography, in Greek origin, two Greek words ‘ge’ meaning ‘earth’ and ‘graphia’ means ‘writing’.
- Aryabhatta was a famous astronomer of ancient India.
- Earth appears blue because its 2/3 surface is covered by water, it is, therefore, called a blue planet.
- Moon diameter is only one quarter that of the earth.
- Moon distance from earth is 3,84,400 km.
- The moon moves around earth in about 27 days, takes exactly the same time to complete one spin, that’s why only one side visible from earth.
- Light travels at a speed of about 3,00,000 km per second, even with this speed, the light of the takes about 8 mins to reach the earth.
- Neil Armstrong was the 1st man to step on the surface of the moon on 21 July 1969.
- Many numerous tiny bodies which move around the sun area called asteroids, found between the orbit of Mars and Jupiter.
- The small pieces of rocks which move around the sun are called meteoroids, sometimes, a meteor falls on the earth.
- Solace system is part of Milky Way galaxy, named Akash Ganga.
- A galaxy is huge system of billions of stars, and cloud of dust and gases.
- Millions of such galaxies make the universe.