An equinoxa time when day and night are nearly the same length is an astronomicalrelating to stars, planets, and objects in space term for one of two relatedconnected or associated with each other events in the year or sky. Most people use it to mean the spring or autumn day when day and night are nearly equal in length.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-13. AI assessment; not a guarantee of accuracy.
Pronunciation
AI-generated pronunciation audio (OpenAI).
Accent: General American English
IPA: /ˈiːkwɪnɑks/
Easy pronunciation: EE-kwi-noks (approximate spelling).
Stress: Stress the first syllable: EE.
This is the noun meaning one of the two times of year when day and night are about equal length.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-13. AI assessment; not a guarantee of accuracy.
Equinox Meaning
The time in spring or autumn when day and night are about the same length.
Part of speech: noun
Definition: Either of the two times of year when the sun crosses the plane of the earth's equator and day and night are of equal length.
Example: The autumn equinox usually falls in September.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-13. AI assessment; not a guarantee of accuracy.
Other Meanings of Equinox
Meaning 2
One of the two points in the sky where the equator and the sun’s path cross.
Part of speech: noun
Definition: Either of the two celestial points at which the celestial equator intersects the ecliptic.
Example: Astronomers refer to the equinoctial point in their calculations.
Synonyms for this meaning:
- equinoctial point — Exact term for the astronomical point.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-13. AI assessment; not a guarantee of accuracy.
Equinox Synonyms
Astronomical point where the celestial equator intersects the ecliptic
- equinoctial point
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-13. AI assessment; not a guarantee of accuracy.
Common Mistakes
- People often use equinox to mean the day itself, but it can also refer more precisely to the astronomical point in the sky.
- Do not confuse equinox with solstice, which is when the sun is farthest north or south and day length is longest or shortest.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-13. AI assessment; not a guarantee of accuracy.
Frequently Asked Questions
What does equinox mean?
An equinox is one of the two times in the year when day and night are nearly equal in length, or the corresponding point in the sky where the sun’s path crosses the equator.
What are the two equinoxes called?
They are the vernal or spring equinox and the autumnal or fall equinox.
Is an equinox the same as a solstice?
No. An equinox is when day and night are about equal, while a solstice is when the sun reaches its farthest north or south position.
Reviewed with OpenAI Decisions. Assessment: accurate. Checked: 2026-10-13. AI assessment; not a guarantee of accuracy.