The Magi had seen this unknown star in the heavens, not a few days, but two years before, as they had informed Herod when he enquired. This caused him to fix “two years old and under;” as it follows, “according to the time he had enquired of the Magi.”
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Serm. 132, App.