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。

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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。

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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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Was it the sight of large crowds braving horizontal rain and sharp winds to cheer the torch relay on its journey to Stratford?

BBC: How Britain rediscovered its forgotten confidence