Saptami

Saptami is the seventh day of the lunar fortnight and is associated with the worship of the sun-god. The sun was extremely brilliant and his radiance threatened to burn up all of creation. On saptami day, the gods appealed to Surya to reduce his brilliance a little. The sun agreed to do this so that the world might be preserved.

(You no doubt remember the story of Samjna and you also remember that Samjna could not stand her husband’s brilliance. Samjna was the daughter of Vishvakarma, the architect of the gods. When Samjna and Surya were re-united after their separation, the problem of the sun-god’s excessive brilliance remained. Vishvakarma thereupon sliced off some of the sun-god’s excess energy. You can read this story in the Markandeya Purana.)