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MCQAdvancedCelestial Coordinates & Time
USAAAO — 2025 First Round
Question 21
What is the largest range of latitudes φ for which, at some time during the day, the line between Rigel (αR = 5h 14m 32s, δR = −8°12′5.9″) and Betelgeuse (αB = 5h 56m 33s, δB = 7°24′40.3″) appears vertical? Answer to within 5 degree accuracy.
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Source
USAAAO 2025 First Round, Question 21. Question text, choices, and answer were transcribed from the official USAAAO exam and solutions PDFs.