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motion: TOC for Knowledge Concepts, Exercises, and Solutions

On January 31, 2000, I carefully measured the position of a star.
On July 31, 2000, I measured it again and, using the method of parallax,
found that the star was 10.0 light-years away.  How much angle did I see
the star move compared to its distant background?  Be sure to convert
light-years into parsecs, and draw a diagram describing your reasoning.