He said: 'The sun (âditya). For all these beings praise the sun when it stands on high. This is the deity belonging to the udgîtha. If without knowing that deity, you had sung out your hymns, your head would have fallen off, after you had been warned by me.'

In plain words: Ushasti says it is the sun, because all beings praise the sun when it is high in the sky. Knowing this is needed to sing the chant properly.