The new year per hindu calendar begins with the month “Chaitra”, also celebrated as First day of Navratri. India Culture has major importance for “Navratri”. Nav- meaning Nine and “Ratri”-meaning nights, so basically its a festival of 9 nights celebrated twice in a year Spring & Autumn, Basically its an important transition weather wise and Of Solar movement.Though, the dates of navratri are calculated based on lunar calendar.
Astronomically speaking, the March equinox occurs when the Sun crosses the celestial equator on its way north along the ecliptic. In the Northern Hemisphere, the March equinox is known as the vernal, or spring, equinox, and marks the start of the spring season.
The New Year per Indian calendar is celebrated by almost all the religions/regions across the India with different name.In South it is celebrated as “Ugadi”,In Maharashtra and Konkan region as “Gudi Padwa”, In Punjab as “Baisakhi”, in Tamilnadu as “Puthandu”, in Assam as “Bohaag Bihu”, in West Bengal and parts of Tripura as “Pohela Boishakh”. Ugadi word is believed to be orginated from word “YUG + AADI” meaning begining of new era.