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MCQIntermediateCelestial Coordinates & Time
BAAO — 2024 Astronomy & Astrophysics Challenge
Question 2
If the Moon appears to be exactly half illuminated by the Sun, what is the Sun-Earth-Moon angle, assuming the Earth and Moon travel in circular orbits? The (centre-to-centre) average distance between the Earth and the Moon is 384 400 km.
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Source
Source: British Astronomy and Astrophysics Olympiad (BAAO), Astronomy & Astrophysics Challenge 2024. Question text, answer-choice text, and answer were transcribed from the official BAAO paper and solutions PDFs; the explanation and metadata are original.