2017年IAO理论低年组第4题-美国日食

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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.

IAO2017Tα4