夏天的时间长，冬天的时间短；只有在春秋分点，白天和黑夜的时间才相等。
Summer hours were long, winter ones short; only at the spring and autumn equinoxes were the hours of daylight and darkness equal.
春秋分日，首先是一年中太阳正东方升起正西方落下的唯一两天。麦克罗伯特说。
The spring and autumnal equinoxes, for starters, are the only two times during the year when the sun rises due east and sets due west, according to MacRobert.
卡西尼环绕土星的任务目前已延长至2017年，以在其春秋分到冬夏至的季节变化时更好地研究这个复杂的行星系统。
The Cassini mission around Saturn has now been extended to 2017 to better study the complex planetary system as its season changes from equinox to solstice.
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