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Question
Distances to the nearest stars (up to 500 ly away) can be measured by a technique called parallax, as shown in Figure 34.26. What are the angles $\theta_1$ and $\theta_2$ relative to the plane of the Earth's orbit for a star 4.0 ly directly above the Sun?
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$90^\circ$ or $89.99977^\circ$ if one has 7 significant figures in the measurements.
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