equinoxes

一年中昼夜等长的两个时刻之一(分别在三月和九月),此时太阳直射赤道,标志着半球春季的开始和另一半球秋季的开始。

One of two times in the year (one in March and the other in September) when the length of the day and the night are equal, which occurs when the sun is directly overhead at the equator; this marks the beginning of spring in one hemisphere and autumn in the other.

二十四小时期间昼夜等长的现象。

The circumstance of a twenty-four hour time period having the day and night of equal length.

太阳视路径与地球赤道平面相交的两个空间点之一。

One of the two points in space where the apparent path of the Sun intersects with the equatorial plane of the Earth.