The ice crystals must be oriented horizontally and the observer's line of sight must be close to horizontal to see the sundogs.
冰晶必须面向水平，而观察者的视线也必须接近水平来观察幻日。
Indeed, horizontal lines are similar to the familiar sight of a horizon line in the distance allowing them to convey a sense of wide-open space.
事实上，横线与熟悉的景物——远方的地平线相似，由此，它们适于传递一种辽阔空旷之感。
The reasons of five error sources including vertical axis, horizontal axis, sight line coder, TV undershooting value which can result in TV tracking system errors are analyzed.
分析了电视跟踪系统的垂直轴、水平轴、视轴、编码器、电视脱靶量五个误差源产生误差的原因，探讨了误差的取舍方法及相应的计算公式。
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