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With reference to the Rotation and Revolution of Earth, consider the following statements:
1. As viewed from the North Star or Pole Star the Earth turns clockwise.
2. Earth’s rotation is slightly slowing with time, thus the day was shorter in the past.
3. The revolution of the Earth in its orbit around the Sun is independent of the rotation around its axis.
Which of the above statements is/are correct?
2 and 3 only
1, 2 and 3
1 and 2 only
3 only
Earth’s rotation is the rotation of the solid Earth around its own axis. The Earth rotates from West to East. Statement 1 is not correct: As viewed from the North Star or Pole Star the Earth turns anticlockwise. The Earth’s axis of rotation meets its surface at the North Pole, in the northern hemisphere. The South Pole is the other point where the axis of rotation intersects its surface, in Antarctica. The Earth rotates once every twenty-four hours with respect to the Sun and once every 23 hours 56 minutes and 4 seconds with respect to the stars. Statement 2 is correct: Earth’s rotation is slightly slowing with time. It is taking Earth longer and longer to complete one full turn—a day—or, technically, a solar day. The solar day is gradually getting longer because Earth's rotation is slowing down ever so slightly. This is due to the tidal effect of the moon has on the Earth’s rotation. Roughly every 100 years, the day gets about 1.4 milliseconds, or 1.4 thousandths of a second, longer. Two key positions along the orbit are Perihelion– the point of closest approach to the Sun. This occurs on ~3 January, when the Sun-Earth distance is ~146 million kilometres. Aphelion– the point at which Earth is farthest from the Sun. The dates of perihelion and aphelion change slowly with time because the whole orbit rotates slowly anti-clockwise in the ecliptic plane, and the shape of the orbit, as expressed by the eccentricity, changes over time. Statement 3 is correct: The revolution of the Earth in its orbit around the Sun is independent of the rotation around its axis.
By: Parvesh Mehta ProfileResourcesReport error
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