different between equinoctial vs equidiurnal

English

Alternative forms

• (archaic) æquinoctial

Etymology

From Latin aequinocti?lis, from aequinoctium + -alis.

Pronunciation

• (Received Pronunciation) IPA^(key): /?kw??n?k?l?/
• (General American) IPA^(key): /?i.kw??n?k.??l/, /??.kw??n?k.??l/

Adjective

equinoctial (not comparable)

1. (astronomy) Of or relating to the spring or autumnal equinox.

   an equinoctial gale or storm, i.e. one happening at or near the time of the equinox, in any part of the world

2. (astronomy) Of or relating to the celestial equator.
3. (uncommon) Equatorial: Of or relating to the equator of the Earth.

Synonyms

• (relating to the equinox): (uncommon) equinoctal, (archaic) equinoxial
• (relating to the terrestrial equator): See equatorial

Derived terms

Translations

Noun

equinoctial (plural equinoctials)

1. The great circle midway between the celestial poles; the celestial equator.
2. (rare) The terrestrial equator.

Translations

References

• John A. Simpson and Edward S. C. Weiner, editors (1989) , “equinoctial”, in The Oxford English Dictionary, 2nd edition, Oxford: Clarendon Press, ?ISBN

English

Etymology

equi- +? diurnal

Pronunciation

• IPA^(key): /??kw?da????(?)n?l/, /?i?kw?da????(?)n?l/

Adjective

equidiurnal (not comparable)

1. Pertaining to the time of equal day and night; applied to the equinoctial line.
   • 1837, William Whewell, History of the Inductive Sciences

     The circle which the sun describes in his diurnal motion, when the days and nights are equal, the Greeks called the equidiurnal

References

equidiurnal in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913.