1. Sunrise and Sunset: The sun rises from the east and sets in the west. Sunrise and sunset occurs at different times at different places. This is because the earth rotates from west to east and therefore, people in the east can see the sun earlier than those in the west. Had the earth been flat, the sunrise and sunset would have occurred at the same time all over the world.
2. Earth is spherical in shape because photograph taken from space. Satellite images are images of Earth collected by imaging satellites operated by governments and businesses around the world.
3. Pole Star: The Pole star can be seen at an angle of 90° at the North Pole. It lies in line with the axis of the earth, and its angle decreases towards the Equator. At the Equator, the angle is 0°. This can happen only in an arc of a circle. If the earth were flat, the Pole Star would have the same height for all latitudes.
3.1. Pole Star
4. Satellite Pictures
5. Circular Horizon
5.1. Circular Horizon: The view of the earth's surface as seen from a height is circular. With increase in altitude the circular horizon also widens. Had the earth's surface been flat the horizon would have been the same irrespective of altitude. In modern days, all radio waves that travel over the earth's surface, can be heard only within a certain horizon.Beyond this, the signal is not received. This is because of the spherical shape of the earth.
6. Sunrise and Sunset
7. Bedfords Experiment
7.1. Three poles - same height, placed equal distance on the bed of a canal.The Bedford Level experiment is a series of observations carried out along a 6-mile length of the Old Bedford River on the Bedford Level of the Cambridgeshire Fens in the United Kingdom, during the 19th and early 20th centuries, to measure the curvature of the Earth.
8. The moon appears as an arc of a circle. Since the earth is bigger than the moon, it is rarely oriented in the same position as the moon but the shadow is always circular.
9. The ship Victoria completed a round the world voyage in 1922. The ship returned to the same place from where it had started.This proves that the earth is round.
10. Lunar Eclipse
10.1. Lunar Eclipse: The shadow of earth on the surface of the moon is clearly visible from earth during lunar eclipse. It appears as an arc of a circle. Since the earth is bigger than the moon, it is rarely oriented in the same position as the moon but the shadow is always circular.
11. Circumnavigation
12. Earth as a heavenl Body
12.1. The Earth as a Heavenly Body: The earth belongs to the Solar system. All planets in this system are spherical in shape. It is because of their continuous rotation. So the earth being the member of the Solar system cannot be an exception.
