As the September 23rd equinox approaches, nights grow longer and a favorable season for aurora begins.
随着9月23日秋分的来临，夜晚越来越长，观测北极光的最佳季节开始了。
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.
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 season of the year between summer and winter lasting from the autumnal equinox to the winter solstice and from september to december in the northern hemisphere; fall.
秋季指一年中介于夏季和冬季之间的一个季节，自秋分起到冬至止，在北半球是九月至十二月；秋天。
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