2019年USAAAO决赛第3题

英文题目

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

中文翻译

3. (7 points) 你在北半球，正在观测赤纬为$$δ=-8^{\circ}$$的恒星A升起，同时赤纬为$$δ=16^{\circ}$$的恒星B正在落下。是A星的下一次落下，还是B星升起先发生？