When al-Ḥusayn radi Allahu ‘anhu was martyred, the world stood still for seven days and the stars collided with one another. He was killed on the Day of ‘Ashūra’ [10th of Muharram] and there was a lunar eclipse on that day and the horizon was a blood-red color for six months after that. The redness of the sky continued after that, even though such a thing had never been seen before. It was also said that not a single stone was overturned in Jerusalem on that day except that fresh blood was found beneath it.
~ Imam Jalāl al-Dīn al-Suyūṭī (Rahimāhullāh) Tārīkh al-Khulafā’, Pages: 184–188. –