עָשָׂ֣ה יָ֭רֵחַ לְמוֹעֲדִ֑ים שֶׁ֝֗מֶשׁ יָדַ֥ע מְבוֹאֽוֹ׃
ער האָט געמאַכט די לבֿנה פֿאַר די צײַטן;די זון װײס איר אונטערגאַנג.
Rashi
He made the moon for the appointed seasons To count with it the times and the festivals.
Rashi
the sun knows its setting But the moon does not know its setting, because sometimes it comes through a long way and sometimes it comes through a short way.