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How do astronomers use parallax to calculate a stars distance?

User Karun
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Astronomers use an Astrolabe

User Kevin Brey
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Astronomers can measure a star's position once, and then again 6 months later and calculate the apparent change in position. The star's apparent motion is called stellar parallax. The distance d is measured in parsecs and the parallax angle p is measured in arc seconds.
User Ziyu Zhou
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