Studie Pagina Chavoerah Maqor

http://www.isawthelightministries.com/daystarts.html
https://judaism.stackexchange.com/questions/69630/how-to-reconcile-if-when-the-jewish-day-was-to-begin-at-sunset
https://judaism.stackexchange.com/questions/47635/is-there-really-evidence-that-the-rabbis-changed-the-days-beginning-from-sunris
https://thetorah.com/does-a-day-begin-in-the-evening/

http://www.isawthelightministries.com/resurrectiontime.html

G3796 opse, ὀψέ late

From the same as opiso (through the idea of backwardness); 
(adverbially) late in the day; 
by extension, after the close of the day -- (at) even, in the end.

G3798 opsios, ὄψιος, ὀψία, ὀψιον (ὀψέ) evening

From opse; late; feminine (as noun) afternoon (early eve) 
or nightfall (later eve) -- even(-ing, (-tide)).