不同的天气和天文条件必须恰到好处，才能产生月虹。
Different weather and astronomical conditions have to be just right for moonbows to be created.
并指出唐山大震的发生时间可能与当天的天文条件有关。
Finally, it is suggested that the occurrence time of Tangshan earthquake was probably associated with the current astronomic conditions.
由于具备最理想的天文观察条件，月球将建设成太阳系最重要的天文观察平台。
With perfect observing conditions, the Moon will be the principal astronomical observation platform in the solar system.
应用推荐