For astronomical calculations, days are specified as the number of days from a reference point — you don't need to identify years, months, or weeks.
对于天文的计算，天被指定为从一个参照点开始的天的数量——不必识别年、月或者星期。
Three studies, presented at a meeting of the American Astronomical Society's solar physics division, all point towards declining sunspot activity into the next decade.
3项发表在美国天文学会的太阳物理学分部会议上的研究都表明，下一个十年中太阳黑子活动将有所衰弱。
The mirror of an astronomical telescope forms at its focal point an image of a star on the axis of the mirror.
天文望远镜把在镜轴上的星体成象在焦点上。
The mirror of an astronomical telescope forms at its focal point an image of a star on the axis of the mirror.
天文望远镜把在镜轴上的星体成象在焦点上。
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