2019年USAAAO决赛第3题
来自astro-init
Jingsong Guo(讨论 | 贡献)2020年3月7日 (六) 17:40的版本
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?