2017年IAO理论高年组第4题-美国日食
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低年组对应问题：2017年IAO理论低年组第4题-美国日食
英文题目
β-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 near the West coast, in the state Oregon, through which the Moon’s shadow ran almost along the latitude φ=45°. The local time (UT-07) Of the shots is indicated below each image. At the moment of totality the Sun was in the South-Eastern part Of the sky, in χ=59,5° from the South in azimuth, at an altitude of h = 41.9°above the horizon. By using the data and making calculations, estimate:
4.1. the speed of the Moon’s shadow in the state Oregon;
4.2. the width of the path of the total eclipse (in km) on its territory.
