2019年USAAAO决赛第2题 - 版本历史

2020年3月7日 (六) 09:38 Jingsong Guo

2020-03-07T09:38:57Z

2020年3月7日 (六) 09:38 Jingsong Guo

2020-03-07T09:38:05Z

Jingsong Guo：创建页面，内容为“==英文题目== 2. (7 points) On the night of January 21st, 2019, there was a total lunar eclipse during a supermoon. At the time, the moon was close to perigee, a…”

2020-03-07T09:16:22Z

创建页面，内容为“==英文题目== 2. (7 points) On the night of January 21st, 2019, there was a total lunar eclipse during a supermoon. At the time, the moon was close to perigee, a…”

新页面

==英文题目==

2. (7 points) On the night of January 21st, 2019, there was a total lunar eclipse during a supermoon. At the time, the moon was close to perigee, at a distance of 351837 km from the earth, which was 1.4721*10^8 km from the sun. The gamma (γ) of a lunar eclipse refers to the closest distance between the center of the moon and the center of the shadow, expressed as a fraction of the earth’s radius. For this eclipse, γ = 0.3684. Given this information, find the closest estimate for the duration of totality of the eclipse.

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	==英文题目==		==英文题目==

−	2. (7 points) On the night of January 21st, 2019, there was a total lunar eclipse during a supermoon. At the time, the moon was close to perigee, at a distance of 351837 km from the earth, which was $$1.4721*10^8$$ km from the sun. The gamma (γ) of a lunar eclipse refers to the closest distance between the center of the moon and the center of the shadow, expressed as a fraction of the earth’s radius. For this eclipse, $$γ = 0.3684$$. Given this information, find the closest estimate for the duration of totality of the eclipse.	+	2. (7 points) On the night of January 21st, 2019, there was a total lunar eclipse during a supermoon. At the time, the moon was close to perigee, at a distance of $$351837 km$$ from the earth, which was $$1.4721\times 10^8$$ km from the sun. The gamma (γ) of a lunar eclipse refers to the closest distance between the center of the moon and the center of the shadow, expressed as a fraction of the earth’s radius. For this eclipse, $$γ = 0.3684$$. Given this information, find the closest estimate for the duration of totality of the eclipse.

←上一版本		2020年3月7日 (六) 09:38的版本
第1行：		第1行：
	==英文题目==		==英文题目==

−	2. (7 points) On the night of January 21st, 2019, there was a total lunar eclipse during a supermoon. At the time, the moon was close to perigee, at a distance of 351837 km from the earth, which was 1.4721*10^8 km from the sun. The gamma (γ) of a lunar eclipse refers to the closest distance between the center of the moon and the center of the shadow, expressed as a fraction of the earth’s radius. For this eclipse, γ = 0.3684. Given this information, find the closest estimate for the duration of totality of the eclipse.	+	2. (7 points) On the night of January 21st, 2019, there was a total lunar eclipse during a supermoon. At the time, the moon was close to perigee, at a distance of 351837 km from the earth, which was $$1.4721*10^8$$ km from the sun. The gamma (γ) of a lunar eclipse refers to the closest distance between the center of the moon and the center of the shadow, expressed as a fraction of the earth’s radius. For this eclipse, $$γ = 0.3684$$. Given this information, find the closest estimate for the duration of totality of the eclipse.