日の出 (hinode) is sunrise.
日没 (nichibotsu) is sunset.
When they say night begins to fall actually means darkness appears therefore night fall.
You may say 'yoru.'
'Hoshi.'
hoshi no yoru
Ching
You may say 'yoru.'
The words night lily are said in Japanese as yoru yuri. These words are said in Italian as notte giglio.
秋 /a ki/ means 'autumn, fall'.
I'm tempted to say Day and Night. Daybreak and Nightfall would make sense, but your questions seems to be asking for one thing, not two.
You mean 'day by day'. In that case you can say 'himashi ni yarimashou'.
yoru - night ookami - wolf yoru ookami - night wolf
A school's "sports day" is called 運動会 (undoukai) in Japanese.