September equinox
Definition
Noun: 1. The September equinox: The precise moment when the Sun appears to cross the celestial equator, moving from north to south. This event marks the beginning of autumn in the Northern Hemisphere and the beginning of spring in the Southern Hemisphere. It occurs around September 22 or 23 each year. 2. The autumnal equinox (Northern Hemisphere): The specific name for the September equinox in the context of the Northern Hemisphere, where it signifies the start of the fall season.
Usage
The term "September equinox" is used to refer to the astronomical event itself, often in scientific, educational, or calendrical contexts. It is a proper noun and is typically capitalized.
Examples
- Noun:
- The September equinox occurred at 2:50 AM UTC this year.
- Day and night are nearly equal in length during the September equinox.
- Many cultures have harvest festivals that coincide with the September equinox.
Advanced Usage
- "the equinox in September": A less formal, descriptive way to refer to the same event.
- We will plant these seeds after the equinox in September.
Variants and Related Words
- Autumnal equinox (Northern Hemisphere): A synonym specifically used in the Northern Hemisphere.
- The autumnal equinox is my favorite time of year.
- Equinox: The general term for either of the two times in the year when day and night are of approximately equal length.
- March equinox / Vernal equinox: The equinox that occurs around March 20, marking the beginning of spring in the Northern Hemisphere.
Synonyms
- Autumnal equinox (contextual)
- Fall equinox (contextual, informal)
Antonyms
- March equinox: The other equinox of the year.
- Solstice: Either of the two times in the year when the sun is at its greatest distance from the celestial equator (e.g., summer solstice, winter solstice).
Noun
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September 22
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