Earth: Portrait of a Planet (Fifth Edition)

The reason for the appearance of the planets moving with respect to the stars.

The reason for the appearance of the planets moving with respect to the stars.

The reason for the appearance of the planets moving with respect to the stars is that planets move in their respective orbits and the starts are placed relatively more distant so that they appear fixed.

The reason for the appearance of the planets moving with respect to the stars is that planets move in their respective orbits and the starts are placed relatively more distant so that they appear fixed.

In the 17 th century, astronomers figured out the exact distance between Earth and sun as 149 , 600 , 000 km (1AU). The ancient Greeks realized that the distance between the earth and the other stars is more than that of the sun and the earth because they appear fixed behind the moon and planets. As the planets that revolve around the Earth and the stars are fixed, they appear moving with respect to stars. The planets positions vary with respect to the stars.

In the 17th century, astronomers figured out the exact distance between Earth and sun as <m:math><m:mrow><m:mn>149</m:mn><m:mo>,</m:mo><m:mn>600</m:mn><m:mo>,</m:mo><m:mn>000</m:mn></m:mrow></m:math> km (1AU). The ancient Greeks realized that the distance between the earth and the other stars is more than that of the sun and the earth because they appear fixed behind the moon and planets. As the planets that revolve around the Earth and the stars are fixed, they appear moving with respect to stars. The planets positions vary with respect to the stars.

The reason for the appearance of the planets moving with respect to the stars.

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