Where does “равноденствие” come from?

равноденствие (Russian) comes from Russian день, from Old East Slavic дьнь, from Proto-Slavic dь̑nь — day.

равноденствие (Russian): equinox intersection of the ecliptic with the celestial equator

Definitions

  1. equinox intersection of the ecliptic with the celestial equator

Ancestry of “равноденствие”, step by step

равноденствие traces back through two separate lines of ancestry.

via Russian день

StepLanguageWordMeaning
1Russianденьday, daytime; afternoon, early evening;...
2Old East Slavicдьньday
3Proto-Slavicdь̑nьday

via Russian ра́вный

StepLanguageWordMeaning
1Russianра́вныйequal (the same in all respects)
Every word from Proto-Slavic dь̑nь →Every word from Old East Slavic дьнь →Every word from Russian день →