Equinoctial
adjective
Related to the time when day and night are of equal length, around 20 March and 22 September.
During the equinoctial period, the length of day and night is approximately the same.

Often appears as...
- equinoctial point
- equinoctial line
adjective
Located at or near the equator, equinoctial regions.
The weather in equinoctial regions doesn't vary much throughout the year.

Often appears as...
- equinoctial heat
- equinoctial climate
noun
An equinoctial storm or gale is one that happens around the time of an equinox.
We were caught in an unexpected equinoctial gale while sailing.

Often appears as...
- equinoctial gale
- equinoctial storm
adjective
Related to the time when day and night are of equal length, around 20 March and 22 September.
During the equinoctial period, the length of day and night is approximately the same.

Often appears as...
- equinoctial point
- equinoctial line
adjective
Located at or near the equator, equinoctial regions.
The weather in equinoctial regions doesn't vary much throughout the year.

Often appears as...
- equinoctial heat
- equinoctial climate
noun
An equinoctial storm or gale is one that happens around the time of an equinox.
We were caught in an unexpected equinoctial gale while sailing.

Often appears as...
- equinoctial gale
- equinoctial storm
Definition 1 of 3

Equinox Dates
Remember 'equinoctial' is linked to two specific dates: around March 20 and September 22.

Scientists use the equinoctial points to mark the beginning of spring and autumn.
Day & Night
'Equinoctial' implies an equal duration of daylight and nighttime, which happens twice a year.

Many cultures celebrate equinoctial events with festivals or rituals.
Compare with
astronomicalcelestialequatorialgeographicalorbitalterritorialtropical
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