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What is the difference between a Julian year and a sidereal year?

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Multiple Choice

Which of the following is the correct definition of a Julian year?

  1. The time it takes for the Earth to orbit the Sun once with respect to the fixed stars.
  2. The time it takes for the Earth to orbit the Sun once with respect to the vernal equinox.
  3. The time it takes for the Earth to complete one rotation on its axis.
  4. The time it takes for the Earth to complete one revolution around the Sun and the Moon.
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