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Explorations an Introduction to Astronomy Thomas T. Arny | ||||||||
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Chapter
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Chapter 12, Figure 2
Figure
12.2
(a) Triangulation to measure a star's distance.
The radius of the Earth's orbit is the baseline. (b) As the Earth moves around the Sun,
the star's position changes as seen against background stars. Parallax is
defined as one half the angle by which the star's position shifts. Size of
bodies and their separation are exaggerated for clarity.
