“2016年IOAA理论第4题-影子”的版本间的差异
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==英文题目== | ==英文题目== | ||
| − | (T4) Shadows | + | '''(T4) Shadows''' |
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An observer in the northern hemisphere noticed that the length of the shortest shadow of a 1.000 m | An observer in the northern hemisphere noticed that the length of the shortest shadow of a 1.000 m | ||
vertical stick on a day was 1.732 m. On the same day, the length of the longest shadow of the same | vertical stick on a day was 1.732 m. On the same day, the length of the longest shadow of the same | ||
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Find the latitude, 𝜙, of the observer and declination of the Sun, 𝛿<sub>⊙</sub>, on that day. Assume the Sun to be a | Find the latitude, 𝜙, of the observer and declination of the Sun, 𝛿<sub>⊙</sub>, on that day. Assume the Sun to be a | ||
point source and ignore atmospheric refraction. | point source and ignore atmospheric refraction. | ||
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| + | ==中文翻译== | ||
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| + | 北半球的一位观测者注意到，一根$$1.000\rm m$$长的竖直棍子在一天中的最短阴影长度为$$1.732\rm m$$。同一天，同一根竖直棍子的最长阴影长度为$$5.671\rm m$$。 | ||
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| + | 计算当天观测者的纬度$$\phi $$和太阳的赤纬$$\delta_{\odot}$$。假设太阳是点光源，忽略大气折射。 | ||
[[分类:视运动]] | [[分类:视运动]] | ||
2019年9月13日 (五) 00:14的最新版本
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英文题目
(T4) Shadows
An observer in the northern hemisphere noticed that the length of the shortest shadow of a 1.000 m vertical stick on a day was 1.732 m. On the same day, the length of the longest shadow of the same vertical stick was measured to be 5.671 m.
Find the latitude, 𝜙, of the observer and declination of the Sun, 𝛿⊙, on that day. Assume the Sun to be a point source and ignore atmospheric refraction.
中文翻译
北半球的一位观测者注意到，一根$$1.000\rm m$$长的竖直棍子在一天中的最短阴影长度为$$1.732\rm m$$。同一天，同一根竖直棍子的最长阴影长度为$$5.671\rm m$$。
计算当天观测者的纬度$$\phi $$和太阳的赤纬$$\delta_{\odot}$$。假设太阳是点光源，忽略大气折射。
