[RadioKid]

I'm not aiming to be accurate. I can not check my post for all Japanese words and I often look over something important. Anyway thank you KyleGoetz-san.

However, please let me try to explain the questions by Kirakira-san.

The words you pointed are all very old words. I do not use those words in usual conversation. I mean I do not use 日本 as "where sun rises" but as "Japan".

日没 is usuallｙ used as "日没時間; the time sun falls" and it means the end of a day. Also 日照時間 actually means the daytime.

people will say as "陽が落ちる" not as "日が落ちる". Also I would say "陽が高いうちに" instead of "日が高いうちに".

Young Japanese would not know the word 旭日. I have never used it too.

I think my answer above will be 90% right as far as in current usual conversations.