Astronomers can accurately foretell the date,time,and length of future eclipses.

文家能精确地预告未来日食月食的日期、刻和。

The astronomers were taking an observation of Jupiter.

文家们正在观测木星。

Astronomers used to ask why only Saturn has rings.

文家们过去一直感到奇怪,为什么只有土星有光环。