An equinox occurs twice a year, when the tilt of the Earth 's axis is inclined neither away from nor towards the Sun , the center of the Sun being in the same plane as the Earth's equator . 春分时，每年两次，当地球的轴倾斜的倾向既不远离也不对太阳中心，在同一平面地球的太阳赤道 。 The term equinox can also be used in a broader sense, meaning the date when such a passage happens.长期春分也可以被用来在更广泛的意义上，这意味着发生这样一段话时的日期。 The name "equinox" is derived from the Latin aequus (equal) and nox (night), because around the equinox, the night and day have approximately equal length. “春分”的名称来自拉丁美洲aequus（等于） 和 NOx（夜），因为周围的春分，白天和黑夜的长度约等于。 At an equinox, the Sun is at one of two opposite points on the celestial sphere where the celestial equator (ie declination 0) and ecliptic intersect.春分，太阳在天球， 天球赤道 （即赤纬0）与黄道相交的两个相反的点之一。 These points of intersection are called equinoctial points : classically, the vernal point and the autumnal point .这些相交点称为春分点 ：古典， 春分点和的秋景点 。 By extension, the term equinox may denote an equinoctial point.推而广之，长期春分表示昼夜平分点。 An equinox happens each year at two specific moments in time (rather than two whole days), when there is a location (the subsolar point ) on the Earth's equator, where the center of the Sun can be observed to be vertically overhead, occurring around 20 March and 22 September each year.每年春分发生2具体的时间瞬间（而非整个天），在1的位置（“ 日下点在地球赤道），其中太阳的中心可以被观察到垂直的开销，发生周围3月20日和9月22日，每年。 Although the word equinox is often understood to mean "equal [day and] night", this is not strictly true.虽然这个词Equinox是通常理解为“平等[一天]晚”，这是不完全正确。 For most locations on earth, there are two distinct identifiable days per year when the length of day and night are closest to being equal; those days are referred to as the "equiluxes" to distinguish them from the equinoxes.为地球上的大多数地方，有两种截然不同的识别白天和黑夜的长度 |
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