2019年USAAAO决赛第9题
来自astro-init
Jingsong Guo（讨论 | 贡献）2020年3月7日 (六) 18:09的版本
英文题目
9. (15 points)
a) Find the shortest distance from Boston ($$42.36010^{\circ} N, 71.05890^{\circ} W$$) to Beijing (39.90420^{\circ} N, 116.40740^{\circ} E)traveling along the Earth’s surface. Assume that the Earth is a uniform sphere of radius 6371 km.
b) What fraction of the path lies within the Arctic circle (north of 66.56080^{\circ} N)?
