Uttarayana in Jyotish or Indian Astrology is the time period of six months in Vedic Astrology in which Sun transits through Makar (10), Kumbh (11), Meen (12), Maish (1), Vrish (2) & Mithun (3) rashis respectively. It starts from 'Makar Sankranti' (around 14th January) every year. During this time interval 'Dinmaan' continuously increases every next day & 'Raatrimaan' continuously decreases. Direction of sun rise is seen to be changing from South-East to North-East. In these six months the seasons ('Ritus') of 'Shishir', 'Vasant' & 'Greeshma' come one after another for every two months.