A diamante contains opposing concepts which meet in the middle line and is structured in a diamond shape. The conception of the Sun and Moon as opposites is very ancient. In the ancient world, the Sun represented the male principle in creation and the Moon the female principle. We see this concept in the Spanish language where sol (sun) takes the masculine article el and luna (moon) takes the feminine article la. The binary opposition of Sun and Moon is not strong in this poem, but I still like it.
shining, glowing, warming
sky, sunset, night, stars
twinkling, reflecting, beaming
Related reading: The Sun and the Moon in Genesis