Ajalon, Or Aijalon, a town of ancient Palestine, about 14 m. N. E. of Jerusalem, allotted to the tribe of Dan, but also spoken of as belonging to Ephraim, to Benjamin, and to Ju-dah. It was of little historical importance, and is chiefly known as the place near which, according to the narrative originally contained in the book of Jasher, Joshua commanded the moon to stand still. The modern town is called Yalo.