Gudi Padwa or Samvatsar Padvo is celebrated as the first day of the year by Maharashtrians and Konkanis. On this day new Samvatsara, which is cycle of sixty years, starts. All sixty Samvatsara are identified by unique name.
Gudi Padwa is celebrated as Ugadi by the people of Karnataka and Andhra Pradesh. Both Gudi Padwa and Ugadi are celebrated on the same day.
Gudi Padwa is Marathi New Year according to Luni-Solar calendar. Luni-Solar calendars consider the position of the Moon and the position of the Sun to divide the year into months and days. The counter-part of Luni-Solar calendar is Solar calendar which considers only position of the Sun to divide the year into months and days. Because of that Hindu New Year is celebrated twice in the year with different names and at two different times of the year. The Hindu New Year based on Solar calendar is known