Based on the principles of earth rotation and revolution, the effects of the obliquity of the ecliptic plane, solar declination, longitude, and solar elevation angle on the formation of the sunlight line on a dark tube sunshine recorder are analyzed. The principles of sunlight-line location displacement with seasonal variation are described, and the regularities of sunlight-line formation at spring equinox, autumnal equinox, winter solstice and summer solstice are discussed. Under the condition of the fixed earth motion trajectory, the day-to-day sunshine path line can be obtained. With the theoretical basis, the software for sunlight line formation are designed and introduced.%根据地球自转和绕太阳公转轨迹规律,分析了黄赤交角、太阳赤纬、经度和太阳高度角对日照迹线形成的影响,解释了春分、秋分、夏至、冬至几个具有代表性日期日照迹线形成的规律,阐述了暗筒式日照计日照迹线位置随季节变化的原理.地球运动轨迹固定,以地球作为参照物,地球相对静止,太阳围绕地球转,太阳光在无任何遮挡的情况下,每日的日照迹线可严格求出.用严谨的理论依据,导出日照迹线公式,并设计出软件,每日日照迹线可任意全真显示.
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