2019年USAAAO决赛第3题

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Jingsong Guo（讨论 | 贡献）2020年3月7日 (六) 17:17的版本 （创建页面，内容为“==英文题目== 3. (7 points) You are in the northern hemisphere and are observing rise of star A with declination δ = -8 degrees, and at the same time a star B w…”）
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英文题目

3. (7 points) You are in the northern hemisphere and are observing rise of star A with declination δ = -8 degrees, and at the same time a star B with declination δ = +16 degrees is setting. What will happen first: next setting of the star A or rising of the star B?

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