冬至圭表测影新探  

A New Exploration of Measuring the Length of the Winter Solstice Shadow by Gnomon

作　　者：王玉民[1] 

机构地区：[1]北京天文馆古观象台,北京100005

出　　处：《中国科技史杂志》2013年第4期453-459,共7页The Chinese Journal for the History of Science and Technology

摘　　要：对中国古代圭表测影技术的起源和发展、冬至圭表测影传统的确立进行探讨,通过分析模拟观测资料发现,与早期测量夏至影长相比,历史上以冬至圭表影长为基准的测量回归年长度方法是一种误差更大的、倒退的技术。This article discusses the origin and development of the use of the gnomon to meas-ure the length of the winter solstice shadow in ancient China. Based on an error analysis of simulated observation data, we find that the method used in early times of measuring the length of the winter solstice shadow to define the tropical year is a technology prone to greater error than that of measuring the summer solstice.

关 键 词：圭表 冬至 半影 景符 误差 

分 类 号：N092[自然科学总论—科学技术哲学] P1-092[天文地球—天文学]