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天文现象的周期性变化规律是人类最早可以感觉到的明显的规律,也是古代西方人制定历法的基础.但是如何精确地测算这种周期性变化以制定历法,需要数学的帮助.在西方数学史上,三角学的概念和基本理论的形成就起源于人类了解和认识天文现象和规律的尝试,是由天文数值
The cyclical variation of the astronomical phenomenon is the earliest visible law of mankind and also the basis for the ancient Westerners to formulate the calendar, but how to accurately measure this cyclical change to make the calendar requires the help of mathematics.In the history of western mathematics , The formation of the concept and basic theory of trigonometry originated from the human try and understanding of astronomical phenomena and laws,