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/ˌɛkwɪdaɪˈɜː(ɹ)nəl/ · adjective
Pertaining to the time of equal day and night; applied to the equinoctial line..
The circle which the sun describes in his diurnal motion, when the days and nights are equal, the Greeks called the equidiurnal
Use equidiurnal when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Equidiurnal means Pertaining to the time of equal day and night; applied to the equinoctial line..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
The circle which the sun describes in his diurnal motion, when the days and nights are equal, the Greeks called the equidiurnal
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