IAS EXAM 2021

  NCERT CLASS 6 GEOGRAPHY   CHAPTER- 3 [MOTIONS OF THE EARTH]   Two types of motion of earth are: Rotation and Revolution. Rotation is the movement of the earth on its axis. Revolution is the movement of the earth around the sun in a fixed path or orbit. The plane formed by the orbit is known as orbital plane. The circle that divides the day from night on the globe is called the circle of illumination. The period of rotation is known as the earth day. 6 hours saved every year is added to make one day(24 hours) in leap year. Leap year has 366 days. A year is usually divided into summer, winter, spring and autumn seasons. The ancient Indian astronomer Aryabhatta had stated that the earth is round and rotates on its own axis. On 21st June, the northern hemisphere is tilted towards the sun.           = Rays of sun falls directly on the Tropic of Cancer.           = The North Pole is inclined towards the sun and the places beyond the Artic circle   experience continuous daylight for about 6

NCERT CLASS 6 GEOGRAPHY CHAPTER- 2 [GLOBE: LATITUDES AND LONGITUDES]   Earth is slightly flattened at the north and the south poles and bulge in the middle. Globe is a true model of the earth. Earth rotates from west to east. Equator is an imaginary line that divides the earth into two equal parts The northern half of the earth is Northern Hemisphere. The southern half of the earth is Southern Hemisphere. All parallel circles from the equator up to the poles are called parallel of latitudes. Latitudes are measured  in degrees. Equator represents the zero degrees latitude. 90degree north latitude marks the North Pole and 90degree south latitude marks the South Pole. Distance from the equator to either of the poles is one-fourth of a circle round the earth, 1/4th of 360, i.e, 90degree. All parallels north of the equator are called ‘north latitudes’. All parallels south of the equator are called ‘south latitudes’. Four important parallels of latitudes-                                    

          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 ‘Pla