How is stellar parallax defined?
A) Stellar parallax is the angle taken up by the diameter of a star as seen from Earth.
B) Stellar parallax is the angle subtended by the radius of Earth's orbit as seen from the star.
C) Stellar parallax is the angle subtended by the diameter of Earth's orbit as seen from the star.
D) Stellar parallax is the angle through which a star moves in our sky over the course of 1 year due to the motion of both the star and Earth.
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