He asked: 'Who are the Adityas?' Yagnavalkya replied: 'The twelve months of the year, and they are Adityas, because they move along (yanti), taking up everything (adadanah). Because they move along, taking up everything, therefore they are called Adityas.'

In plain words: Yagnavalkya says the Adityas are the twelve months of the year. They are called Adityas because they keep moving on and take everything along with them.