English-Estonian translations for autumnal equinox

• sügisene pööripäev
• sügisene võrdpäevsus

Definition of autumnal equinox

• The moment when the sun appears to cross the celestial equator while tilting away from the observer, taking place in September in the northern hemisphere and March in the southern hemisphere

Related words

• autumnal
• aestivoautumnal
• autumnally
• autumnal equinoctial point