jyotisha and the sky
What is Sankranti and why is the Sun's transit between signs significant?
What Sankranti means
The word Sankranti means the Sun's entry into a new rashi, or zodiac sign. There are twelve rashis, so there are twelve Sankrantis in a year. In Hindu tradition the Sun is not just a star. It is seen as a living force that shapes time, seasons, and human life. Each time the Sun crosses into a new sign, it marks a shift in that force. The exact moment of the transit is calculated using traditional astronomical texts and regional almanacs called Panchangas. Prayers and rituals are often timed to that precise moment.
The two that matter most
Two Sankrantis stand out above the rest. Makar Sankranti, when the Sun enters Capricorn around the middle of January, is the most celebrated across India. It marks the Sun's turn northward, called Uttarayana, when days begin to grow longer. This is seen as an auspicious shift, a time of light returning. The other is Karka Sankranti, when the Sun enters Cancer and begins its southward journey, called Dakshinayana. That period is seen as quieter and more inward. Together these two mark the great rhythm of the solar year.
Harvest, fire, and the sky
Makar Sankranti lands at the heart of the harvest season across much of India. Different regions celebrate it in their own way. In Tamil Nadu it is Pongal, a four-day festival of gratitude for the harvest. In Punjab it is Lohri, celebrated with bonfires the night before. In Gujarat and Rajasthan it is Uttarayan, famous for kite flying. The names and customs differ, but the root is the same: the Sun crossing into Capricorn, the harvest coming in, and the days growing longer. The Sun is thanked directly in many of these celebrations.
What is happening in the sky
Astronomically, the Sun moves through the zodiac as Earth orbits it over the course of a year. The Hindu calendar tracks this using a sidereal system, meaning it measures the Sun's position against the actual background of stars. This differs from the Western tropical system, which is fixed to the seasons. Because of this difference, Makar Sankranti falls in mid-January rather than at the December solstice. The solstice is when the Sun actually begins its northward climb, but the sidereal calendar places the Sun's entry into Capricorn a few weeks later. Both are real astronomical events measured differently.
How it is kept today
For many families, Sankranti is one of the few festivals tied directly to the sky rather than to the lunar calendar. People check the Panchanga for the exact time of the transit. Sesame sweets, sugarcane, and rice dishes appear in homes across regions. In the diaspora, Makar Sankranti and Pongal are often the occasions that bring communities together in January. The specific customs vary widely by region and family, but the sense of marking the Sun's movement stays at the centre.