Avatarika
तथा अस्तमिते आदित्ये, याज्ञवल्क्य, किंज्योतिरेवायंपुरुष इति- चन्द्रमा एवास्य ज्योतिः ॥
In plain words
In the same way: once the sun goes down, Yājñavalkya, what does a person live by then? The moon -- the moon becomes his light.
Close to the Sanskrit
Likewise: "When the sun has set, Yājñavalkya, what light does this person then have?" -- "The moon indeed is his light."