名词
中文翻译：动力日
同义词：
['dynamical day', 'dynamical equinox']
例句：
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1.The solar equinox is a time when the sun's position in the sky is at its highest point.
太阳黄经达到最高点的时期称为太阳黄经点。
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2. During the solar equinox, the earth's axis and orbit are aligned, causing the northern and southern hemispheres to have equal amounts of sunlight.
在太阳黄经时，地球的轴和轨道对齐，使得南北半球接收到的阳光量相等。
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3. This phenomenon has been observed by astronomers for thousands of years and is still studied today.
这种现象已经由天文学家观察了数千年，并且仍然被研究着。