Which of These Is NOT a Contributor to Librations, the "Nodding

question 22

Multiple Choice

Which of these is NOT a contributor to librations, the "nodding" back and forth of the Moon that allows observers on Earth to see more than half of it?

• A) The Moon's rotation axis is not perpendicular to its orbital plane.
• B) The Moon's orbit around Earth and the ecliptic are not the same plane.
• C) The Moon is not always the same distance from Earth.
• D) Earth does not move at a steady rate in its orbit about the Sun.

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