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天文学:年差が 1 秒角 = 1 パーセク ≈ 206,265 AU。 tan(1'') * d = 1 UA で確認せよ。
天文学:年差が 1 秒角 = 1 パーセク ≈ 206,265 AU。 tan(1'') * d = 1 UA で確認せよ。
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