In lunar religious calendars, Phalgun may begin on either the new moon or the full moon around the same time of year, and is usually the twelfth month of the year. The holidays of Holi (15 Phalgun) and Maha Shivaratri (14 Phalgun) are observed in this month.
In solar religious calendars, Phaalgun begins with the Sun's entry into Aquarius, and is usually the eleventh month of the year.