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Q.3. Explain how size of a planet or star is measured using parallax method.
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Explain parallax method for measuring distance of a nearly star. The distnace can be measured by measuring the parallax angle θ. It is subtended by the distant astronomical object at the two locations on the earth separated distance b. Thus, θ=db where d be the measuring distance
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Astronomers estimate the distance of nearby objects in space by using a method called stellar parallax, or trigonometric parallax. Simply put, they measure a star's apparent movement against the background of more distant stars as Earth revolves around the sun.
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