The age-old tradition entails worship of Sun God, embodied in cosmic energy, and is observed mainly by people from Bihar and eastern UP.
From Kalindi Kunj Ghat in south Delhi to Wazirabad and Kudesia Ghats in north, people from the two states thronged the riverbanks last evening and in the wee hours today in colourful processions.
The four-day celebrations mark the tradition of worshipping the Sun God and its radiant energy, references to which are found in sacred Hindu texts and centuries-old paintings and other artwork.
On the following day, 'kharna', they prepare 'kheer' on earthen fire, which is distributed as 'prasad'.
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During the next two days, they make an offering ('arghya') to the setting sun and the rising sun in succession, thus bringing down curtains on the celebrations, considered the grandest festival of Bihar and Poorvanchal region.
The national capital has a sizeable population of people hailing from the two states.
After offering the morning 'arghya' today, families eat 'thekua' as the main prasad, cooked by devotees themselves last night and then engage in a grand feast. Children also burst crackers.
In north and east Delhi too, people congregated at the nearest ghats or water bodies and paid obeisance to the rising sun.
At some places, temporary shallow pits were dug out and filled with water, especially in parks for convenience of people.
The festival attracts crowds from all parts of the national capital region, and long traffic jams were witnessed near the ghats last evening.
From sanitation to beautification municipal bodies had made all arrangements and spruced up the ghats for the occasion.