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प्रश्न
Provide reliable evidence to prove that the earth is spherical in shape.
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उत्तर
The earth can be clearly seen spherical in the photographs from the satellite. Other proofs are the sight of the mast of a ship first before the ship appears, varying heights of the poles fired at different places at an interval of 5 km, through the Bedford Level Experiment and the sight of Pole Star at 90° from the North Pole and the view of the earth’s horizon as a circular from higher altitudes.
संबंधित प्रश्न
Study the picture and answer the questions that follow.

(a) What is meant by the Solar System?
(b) Give two differences between a planet and a star.
(c) Name the planets known as terrestrial planets.
(d) Give two advantages the earth has over other planets.
(e) What are satellites?
In which unit the distances of universe are measured?
Name the planet farthest from the Sun.
How many satellites are there in Solar System?
What is the period of rotation of Moon?
Give a reason for the following:
Earth and its Moon are called a double planet.
Distinguish between the following pair.
Planet and Satellite.
Why is the following planet not inhabitable?
Jupiter
Who am I?
I turn around myself and revolve around the sun.
______ is called Earth’s twin.
