Description: This article discusses the issue of slope sun in real life applications. Based on the assumptions in the model, we projected on the ground near the sun as a uniform motion, with an emphasis on the critical state will be discussed: only preserved, there is no top-light situations only the top light, there is no side light of the situation both There Side light another top-light situation. And then from the daily life of several common trend of things, southeast, north and south to analyze
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