Celebrated In: India
Gudhi Padva is the Marathi name for Chaitra Shukla Pratipada. It is celebrated on the first day of the Chaitra month to mark the beginning of the New year according to the lunisolar Hindu calendar. This day is also the first day of Chaitra Navratri and Ghatasthapana also known as Kalash Sthapana is done on this day. This new moon day has special meaning from Astronomy point of view. The Sun is supposed to be in first point of Aries, (Hamal) which is first sign of zodiac and is a natural beginning of spring. Many civilzations have known this. People of ancient Egypt knew this and Nowruz( literally "New Day" ) in Persia is also based on this observation. The Sun however may not be exactly in Aries due to Lunar month. This is adjusted by adding a "Adhik" (Literally an extra) Lunar month every three years to ensure New Year Day ( "Gudhee Padwa") indeed matches observed season. See Panchang for details.
It has evolved into of many festivals Holi, Gudhee Padwa around this part of year in India It is one of the most famous harvesting festival in India.