Comparative cheke of Cosmic phenomena in the befor and after the era of Appearance

Many signs of the Appearance has been neglected By the researchers of The field of Mahdaviyat Because its from Singing as unconditional symptoms. This is despite the fact that the comprehensive examination of the narrations of this part of the teachings of Mahdavi proves several points: First, a significant part of these narratives is part of common narratives that are expressed in narratives sources of two groups(Shia and Sunni). Second, the content of many of these narratives, despite being apparently contradictory to natural phenomena, After scientific research, is in the framework of natural events, And can not be regarded as an extraordinary phenomenon that is beyond the capacity of human knowledge. And thirdly, the content of many of these signs, despite the different appearance of each other, by help of each other, are trying to prove a single phenomenon that has a significant effect on events after the Appearance . One of these signs is the eclipse of the sun and the eclipse moon in Abnormal time that In addition to being quoted in Shia and Sunnis' narrative resources, that Its also confirmed by three categories of narratives in the Shiite and Sunni sources.