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?