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G-6: SOLAR SYSTEM

We can see the full moon only once in about a month’s time. It is Full moon night or Poornima .  A fortnight later, you cannot see it at all. It is a New moon night or Amavasya . On this day, you can watch the night sky best, provided it is a clear night. We can’t we see the moon and all those bright tiny objects during day time because of the very bright light of the sun that does not allow us to see all these bright objects of the night sky . The sun, the moon and all those objects shining in the night sky are called celestial bodies. Some celestial bodies are very big and hot. They are made up of gases. They have their own heat and light, which they emit in large amounts. These celestial bodies are called stars. We may notice various patterns formed by different groups of stars. These are called constellations . Ursa Major or Big Bear is one such constellation. One of the most easily recognisable constellation is the Saptarishi (Sapta seven, rishi-sages). I...

G-6: MOTIONS OF THE EARTH

The earth has two types of motions: rotation ( घूर्णन )  and revolution ( परिक्रमण ) . Rotation is the movement of the earth on its axis. The movement of the earth around the sun in a fixed path or orbit is called Revolution . The axis of the earth (an imaginary line), makes an angle of 66½° with its orbital plane . The plane formed by the orbit is known as the orbital plane. The circle that divides the day from night on the globe is called the circle of illumination . This circle does not coincide with the axis. The earth receives light from the sun. Due to the spherical shape of the earth, only half of it gets light from the sun at a time. The portion facing the sun experiences day while the other half away from the sun experiences night. The earth takes about 24 hours to complete one rotation around its axis. The period of rotation is known as the earthday . This is the daily motion of the earth. Revolution takes 365¼ days (one year) to revolve around the sun. We ge...

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