《旧唐书·本纪·卷十八》
二月十六日夜，月色少光，至一更一点时干犯荧惑星，相距仅四寸。
丁亥夜，月色少光，至一更一点，犯荧惑，相去四寸。
On the night of the 16th day of the second lunar month, there was little moonlight, and at one hour and one point, it clashed with the planet Mars, which was only four inches apart.