Other texts derive "rāhu" differently. For example, the Pāli "Apadāna", as well as another account found in the texts of monastic discipline of the Mūlasarvāstivāda tradition, derive "rāhu" from the eclipse of the moon, which traditionally was seen to be caused by the asura (demon) Rāhu. The "Apadāna" states that just like the moon is obstructed from view by Rāhu, Prince Siddhārtha was obstructed by Rāhula's birth. The Mūlasarvāstivāda tradition relates, however, that Rāhula was conceived on the evening of the renunciation of Prince Siddhārtha, and born six years later, on the day that his father achieved enlightenment, which was during a lunar eclipse. Further credence is given to the astrological theory of Rāhula's name by the observation that sons of previous Buddhas were given similar names, related to constellations.