Analysis of The Last Sunset

Birds sing a cheerful mourning song,
For they know this parting won't last.
And tomorrow the sun will be back,
To light the world- bright and vast.
They don't see the grief,
The fiery teardrops as the sun cries.
This is it, thinks the sun,
As the last ray shivers and dies.
The sun sets, the birds dirge;
And out goes the light.
Go home little children,
For soon there will be night.