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在古代,计时除了靠大公鸡、沙漏之外,还使用日晷(gui)。这是一种利用太阳来记录时间的古老装置。它看起来与现在的钟表十分类似,不过它的指针不用动,移动的是太阳产生的影子哦!多种多样的日冕赤道式:这是最简单的曰晷,只是圆盘的中心穿过一根平行于地球自转的指if而圆盘则与地球赤道平面保持平行。通常正午时指针的影子在最低处,早上6点在西侧,晩6点在东侧。但冬季时,圆盘的北侧照不到光,只能使用南侧,尔夏季反之。
In ancient times, besides the big cock and the hourglass, the clock used the gui. This is an ancient device that uses the sun to record time. It looks very similar to the current watch, but its pointer does not move, moving the shadow of the sun! A variety of coronal equatorial: This is the simplest said, but the center of the disc through a The root is parallel to the Earth’s rotation if and the disk is parallel to the Earth’s equatorial plane. The shadow of the noon pointer is usually at the lowest point, at 6 am on the west and 6 o’clock on the east. But in winter, the northern side of the disc can not see the light, can only use the south side, summer instead.