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1·We hear about astronomy too: the obliquity of the ecliptic and the dynamics of asteroids.

我们还会听到一些天文学的名词：如黄赤交角和小行星动力学等等。

2·The Angle between the plane of the ecliptic and the equatorial plane is the obliquity of the ecliptic.

黄道面与赤道面的夹角是黄道的倾角。

3·The obliquity of ecliptic is the fundamental cause of the seasons.

黄道面与赤道面的夹角是黄道的倾角。