Night and day

The two friends in the high
In the world of sky
The one end is dark
Called as night, has its own spark
On the other end is light
Called as day, has its own delight
I asked the sky,
If they are in different ends,
How do they become friends?
Night is delight to embrace the vulnerability
And day has it's spark to exhibit the might
Thus, they share their elements
To soothe people sentiments.