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MCQBeginnerCelestial Coordinates & Time
USAAAO — 2023 First Round
Question 5
Friedrich Bessel was the first person to quantitatively measure the annual change in stellar positions due to the motion of the Earth around the Sun. This change is known as stellar parallax. Bessel determined the stellar parallax for 61 Cygni to be about 1/3 arc-seconds. What is the distance to 61 Cygni from Earth?
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Source
USAAAO 2023 First Round. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.