Vocabulary in Context: Phosphorescent

Consider the following excerpt from a fictional narrative:

As the sun dipped below the horizon, the town seemed to transform. Streetlights flickered on, casting phosphorescent shadows across the asphalt. The aroma of roasting chestnuts wafted through the air, mingling with laughter and the distant strains of a violin. People wandered through the evening market, their faces illuminated with a sense of anticipation for what the night might hold.

What does the word phosphorescent imply in this context?