phālguna-pūrṇimā - of the full moon of the month of Phālguna; sandhyāya - in the evening; prabhura - of Lord Śrī Caitanya Mahāprabhu; janma-udaya - at the time of His birth; sei-kāle - at that moment; daiva-yoge - accidentally; candra-grahaṇa - lunar eclipse; haya - takes place.

On the full-moon evening of the month of Phālguna when the Lord took birth, coincidentally there was also a lunar eclipse.