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明制简仪上地平日晷时间刻线的偏差与地理经度差修正问题的考证 文集
2014
Authors:  刘炎;  张旸
Adobe PDF(972Kb)  |  Favorite  |  View/Download:247/112  |  Submit date:2015/05/04
明制简仪  地平日晷  刻线偏差  经度差改正  明代建造  
明制简仪附加地平日晷之惑--由“高平子疑问”所想到的 文集
2014
Authors:  刘炎;  张旸
Adobe PDF(3707Kb)  |  Favorite  |  View/Download:160/30  |  Submit date:2015/05/04