“2019年IOAA天文馆观测第3题”的版本间的差异
Jingsong Guo（讨论 | 贡献） （创建页面，内容为“==英文题目== PROBLEM 3 For this view, we are now standing on the Moon. At this instant viewed, the Earth is centrally eclipsing the Sun (see the red circle on…”） |
Jingsong Guo（讨论 | 贡献） |
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| 第9行： | 第9行： | ||
QUESTIONS / TASKS: | QUESTIONS / TASKS: | ||
| − | 3.1. At the time of this observation, which season is it in Hungary? | + | 3.1. At the time of this observation, which season is it in Hungary? |
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3.2. There is a yellow circle on the projected sky (next to the red circle), which denotes minor | 3.2. There is a yellow circle on the projected sky (next to the red circle), which denotes minor | ||
| 第17行： | 第15行： | ||
distance to the Moon at this instant. (Rounded to the nearest integer in units of million km.) | distance to the Moon at this instant. (Rounded to the nearest integer in units of million km.) | ||
Assume all orbits to be circular. | Assume all orbits to be circular. | ||
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3.3. Approximately how much time (in Earth days) after the projected event will … | 3.3. Approximately how much time (in Earth days) after the projected event will … | ||
| − | …the Sun set at your observing site? | + | …the Sun set at your observing site? |
| − | …the Earth set at your observing site? | + | …the Earth set at your observing site? |
3.4. Determine the Lunar (Selenographic) coordinates of this observing site (as defined in the | 3.4. Determine the Lunar (Selenographic) coordinates of this observing site (as defined in the | ||
lunar map on the next page): | lunar map on the next page): | ||
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What is the name of the large surface lunar area, where your observing site is situated? Do not | What is the name of the large surface lunar area, where your observing site is situated? Do not | ||
use your national language, please use the official IAU nomenclature. | use your national language, please use the official IAU nomenclature. | ||
(See lunar map on next page.) | (See lunar map on next page.) | ||
| − | + | ||
3.5. Estimate the distance from the observing site to the Apollo-11 landing site (0.6875 N, | 3.5. Estimate the distance from the observing site to the Apollo-11 landing site (0.6875 N, | ||
23.4333 E): | 23.4333 E): | ||
| − | + | ||
==中文题目== | ==中文题目== | ||
2019年9月2日 (一) 13:43的版本
英文题目
PROBLEM 3 For this view, we are now standing on the Moon. At this instant viewed, the Earth is centrally eclipsing the Sun (see the red circle on the sky). Consequently the Moon is at one of its nodes now. Assume the longitudinal and latitudinal librations are exactly 0° at this moment.
QUESTIONS / TASKS:
3.1. At the time of this observation, which season is it in Hungary?
3.2. There is a yellow circle on the projected sky (next to the red circle), which denotes minor planet Juno, which is at a distance of exactly 3 au from the Sun at this moment. Estimate its distance to the Moon at this instant. (Rounded to the nearest integer in units of million km.) Assume all orbits to be circular.
3.3. Approximately how much time (in Earth days) after the projected event will … …the Sun set at your observing site? …the Earth set at your observing site?
3.4. Determine the Lunar (Selenographic) coordinates of this observing site (as defined in the lunar map on the next page):
What is the name of the large surface lunar area, where your observing site is situated? Do not use your national language, please use the official IAU nomenclature. (See lunar map on next page.)
3.5. Estimate the distance from the observing site to the Apollo-11 landing site (0.6875 N,
23.4333 E):
