kayleeweber2005
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Which statement provides the best evidence that Earth has a nearly spherical shape?
1.
2.
The Sun has a spherical shape.
The altitude of Polaris changes in a definite pattern as an observer's latitude chang
Star trails photographed over a period of time show a circular pattern.
The lengths of noontime shadows change throughout the year.
3.
4
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Answer:

2. The altitude of Polaris changes in a definite pattern as an observer's latitude changes.

Explanation:

Since Polaris is located over the Earth’s tilt of axis it appears to follow the observer's latitude. If you were to follow Polaris from the North Pole(0°) to the Equator (90°), it will make a half circle. This will prove that the earth has a spherical shape.

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From the options given, the best evidence which proves the spherical shape of the earth is the relationship between the change in altitude of the Polaris and latitude of the observer.

  • The degree of latitude at the equator is 0° and the altitude of the Polaris is also 0 at this position.

  • Similary, the degree of latitude at the north pole and other locations give the same value for the altitude of the Polaris at these locations.

  • This means that there is a definite change in the altitude of the Polaris with the latitude of the observer.

  • The shape of the sun and length of noon time shadow aren't proofs of the sphericity of the earth.

Therefore, aside the definite proportional change associated with altitude and latitude change, other proofs of the spherical nature of the earth are the circumnavigation of the earth and aerial photographs.

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