If you want to understand the philosophical significance of a sunset, you should read Thomas Gray’s poem
"Elegy Written in a Country Churchyard "
The first verse will be familiar
“The curfew tolls the knell of parting day,
The lowing herd wind slowly o’er the lea,
The ploughman homeward plods his weary way,
And leaves the world to darkness and to me.”
Published in 1751. There are many verses.
It is about the passing of life which is clearly symbolised by the passing of daylight.
A truly beautiful, simple poem, written while the author was mourning the death of a friend.
So a sunset is a time mark … a beginning and an end.
A time for reflection. A quiet time.
Sometimes its just as beautiful to watch a sunset with your back facing West, where I live, at sunset and I look East - I can see the orangy (think so anyway - I’m colour-blind) glow on gum tree tree trunks and foliage, and to the foothills and the sun reflected from the windows of a few houses on the hills (there’s not a lot of housing there).
Also - “crepuscular” also refers to dawn… Animals that are “crepuscular” are mostly only active at dawn and dusk…