Every dawn begins with me.
At dusk I'll be the first you see,
and daybreak couldn't come without.
What midday centers all about.
Daisies grow from me, I'm told.
And when I come, I end all code,
but in the sun I won't be found.
Yet still, each day I'll be around.
Answer: The letter "D".
This riddle appears in the following downloadable PDF files: