וְה֗וּא כְּ֭חָתָן יֹצֵ֣א מֵחֻפָּת֑וֹ יָשִׂ֥ישׂ כְּ֝גִבּ֗וֹר לָר֥וּץ אֹֽרַח׃
Which is as a bridegroom coming out of his chamber, and rejoiceth as a strong man to run his course.
Tikkunei Zohar
When the groom, that is, the sun, comes to light up the moon, she decorates her hair with thirteen decorations - twelve constellations and the moon. And He (Psalms 19:6) "is like a groom coming forth from his chamber; like a hero, eager (yasis) to run," - to run his courses in the heavens. He surely peeks (yatsits) at her, as it says (Song of Songs 2:9) "Peeking through the lattice." - looking at her in the heavens.