Definitions ofautumnal equinox noun (astronomy) the equinoctial point that lies in the constellation of Virgo see more noun September 22 synonyms:September equinox,fall equinox see more Cite this entry Style: MLA "Autumnal equinox."Vocabulary.com Dictionary,Vocabulary.com, https://www.vocabulary.com...
Studying the stars helps astronomers understand the changes of the seasons on Earth. To learn more, you can read or watch the lesson named Autumnal Equinox Lesson for Kids: Definition & Explanation. The following topics will be covered:
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During anequinox, the Suncrosses what we call the “celestial equator”—an imaginary extension of Earth’s equator line into space. The equinox occurs precisely when the Sun’s center passes through this line. For those in the Northern Hemisphere, when the Sun crosses the equator going from ...