It should be noted that Bhadra prevails during first half of Purnima Tithi. Hence one should wait for Bhadra to get over before starting any auspicious work. In North India it is customary to tie Rakhi in the morning which might not be suitable time to do it. The DrikPanchang's team believes that it might be due to ignorance. When such information is easily available one should avoid tying Rakhi during Bhadra.