ἐν δὲ μηνὸς πρῶτον τύχεν ἆμαρ → it chanced to be on the first of the month, that day fell on the first of the month
P. and V. δῆλος, ἔνδηλος, σαφής, ἐναργής, φανερός, ἐμφανής, V. σαφηνής; see clear.