heliacal rising and setting
... 弹性地蜡 helenite 偕日升降 heliacal rising and setting 螺旋流 helical flow ...
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他们关注的不是星辰偕日升降，也不是地平线附近的星辰，而是永不落下的北极星和拱极星。
They concentrated attention, not on heliacal risings and Settings, not on the horizon, but on the pole star and on the circumpolar stars which never rise and never set.
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