What tool did Shapley use to estimate the Sun's position in the Milky Way?
Telescope
Abacus
Parallax
Quadrant
Answer
Parallax is the apparent change in the position of an object relative to a background as the observer's position changes. In the case of Shapley's measurement of the Sun's position, the observer was the Earth, and the background was the stars in the Milky Way.
Shining a Light on Harlow Shapley: The Scientist and Advocate Quiz
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