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
γάρ, δή, δήπου, δήπουγε, δήπουθεν, δηλαδή, δηλονότι, δῆλα δή, δῆτα, ἀλλά, ἄρα