The speaker starts by looking up at a night sky crowded with stars, which they imagine dancing and singing alongside the moon. The moon seems happy, even smiling, because it is surrounded by company. The mood is light and playful at first, with a childlike wonder in the way the sky is described.
Then the poem turns. The speaker asks what happens tomorrow, when the stars are gone. Will the moon still look so content, or will the night feel empty, "a night with no soul"? That question brings in a quieter, more uneasy feeling about whether happiness depends on the people around us.
The last two lines turn toward the reader: "Are you the moon or the stars?" It asks us to think about our own place among others. Are we the ones who need company to shine, or the ones who give others their light? The language is simple and a little uneven, but that plainness makes the question feel honest and personal.