“2017年IAO理论低年组第4题-美国日食”的版本间的差异
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'''4.2.''' time '''t''' (in seconds) between the positions 1 and 2 of the shadow as marked at Fig. α4. | '''4.2.''' time '''t''' (in seconds) between the positions 1 and 2 of the shadow as marked at Fig. α4. | ||
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2019年8月17日 (六) 00:45的最新版本
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高年组对应问题：2017年IAO理论高年组第4题-美国日食
英文题目
α-4. Eclipse in USA. A little more than two months ago, on August 21, 2017 from West to East of the USA territory a total solar eclipse was observed. The middle line of the track of the eclipse is shown schematically on the map. Below are four pictures taken by the Bulgarian-Russian group of observers who were in state of Oregon, through which the Moon's shadow ran as it shown in Fig.α4. (see separate sheet). The local time (UT-07) of the shots is indicated below each image. By using the data and making calculations, estimate:
4.1. altitude of the Sun in Oregon at the moment of totality;
4.2. time t (in seconds) between the positions 1 and 2 of the shadow as marked at Fig. α4.
