Bhai Dooj is an important Hindu festival celebrated to strengthen the bond of love between brothers and sisters. This festival is celebrated on the second day, which means, Dwitiya Tithi, as per Hindu calendar.
Bhai Dooj is also known by the name Bhratri Dwitiya. There are two celebrations of Bhai Dooj as per Hindu calendar. The more popular Bhai Dooj is the one is that is observed for two days after Deepavali Puja.
Holi Bhai Dooj is a less known festival but is popular in some regions. Famous texts on Hindu festivals, such as Dharma Sindhu, Nirnaya Sindhu and Vratraj do not mention about Holi Bhai Dooj. In order to observe Holi Bhai Dooj, it is essential that Dwitiya Tithi prevails. Therefore, depending on the day of Holika Dahan, Holi Bhai Dooj is observed either next day or the second day after Rangawali Holi.