In response to many enquires about Eid al-Adha ,The Religious Authority, Sayyed Muhammad Hussein Fadlullah confirmed that Tuesday 11/12/2007 is the first day of the month of Zil-Hijaa. This ruling is based on the fact that the astronomical calculations have proved that the crescent of the month of Zil-Hijja can not be seen any where in the world or Sunday night. Thus Monday is the last day of the month of Zil-Qi'da.
Moreover, the astronomical calculations indicate that in many Islamic regions the crescent will be born after the sunset and exactly at 17:14 international meantime. This means that relying on testimonies of seeing the crescent Sunday night is wrong, since there is nothing to see.
As for performing the pilgrimage on the basis of considering that Monday is the first day of Zil-Hijja, it is considered valid although it does not confirm with reality, since this issue is related to performing the pilgrimage only, while the other religious issues that are based on establishing the beginning of the lunar month like the Eid prayer, and the impermissibility of fasting on the Eid day and other similar issues, are determined by establishing the beginning of the month of Zil-Hijja which is on Tuesday 11/12/2007.