"Vusvajarnab said 'Your form is hard to bear, for it has excessive energy. Therefore Samjna is unable to bear it and is practising asceticism in the forest. You will see your well behaved wife today practising great asceticism in the wilderness, because of your excessive form. I recall the speech of Brahma and if it please you. O lord, lord of the day, I will restrain your form and make it lovely.' 'So be it,' replied the lord sun to Tvastr and Visvakarman, having received permission from Vivasvat, placed his spherical form upon his lathe on the island of Saka and began to cut down his energy . . .

Thus Visvakarman praised the sun, and he kept a sixteenth part of the energy of the lord of the day in a spherical form. When fifteen parts of his energy had been cut away, then the body of the sun was extremely lovely and charming. And with the energy that had been cut away was made the discus of Visnu, the trident of Sarva, the palanquin of Kubera (the lord of wealth), the rod of the lord of the dead, and the spear of the general of the gods. And Visvakarman made the brilliant weapons of the other gods, for the quelling of their enemies, out of the energy of the sun. When his energy had been thus cut away, Martanda had a body that was beautiful in every limb but did not shine with excessive energy."

Hindu Myths p 68-69.