在《PONS词典》中的词汇
有关生物学的词语（Klett）
单语范例（未经PONS编辑处理）
However, the vernal equinox and the full moon were not determined by astronomical observation.
en.wikipedia.org The reason for this behaviour is (as explained above) that it tracks the observed vernal equinox.
en.wikipedia.org It is a solar calendar that is designed to maintain synchrony with the vernal equinox tropical year.
en.wikipedia.org The first rays of new sun fall on this head in the days of the vernal equinox.
en.wikipedia.org In one version of this definition, winter begins at the winter solstice and ends at the vernal equinox.
en.wikipedia.org