As-salamu `alaykum.there is a controversy regarding offering the Tarawih Prayer on the eve of the 30th of Sha`ban — laylat ash-shak or the Night of Doubt — in which the crescent moon of Ramadan is to be sighted in order to determine if the next day is Ramadan or not. (The eve of the 30th is the night following sunset on the 29th of Sha`ban, or in other words, the night preceding the 30th.) Many people perform the Tarawih Prayer on that night following `Isha' Prayer before making sure whether Ramadan will start. Those people may later discover that that night is proved not to be the first night of Ramadan. Some other people wait until they make sure if Ramadan will start to see whether they can offer the Tarawih Prayer or not. Which of these is the more correct approach?