It is therefore (perhaps with Bhaga ?) one of the most ancient personal designations of the sun,--one, perhaps, developed from a mere name into a separate deity.
HEAVEN AND EARTH.
Not only as identical with the chief god of the Greeks, but also from a native Indic point of view, it might have been expected that Dyaus (Zeus), the 'shining sky,' would play an important role in the Hindu pantheon.

But such is not the case.

There is not a single hymn addressed independently to Dyaus, nor is there any hint of especial preeminence of Dyaus in the half-dozen hymns that are sung to Heaven and Earth together.

The word _dyaus_ is used hundreds of times, but generally in the meaning sky (without personification).

There is, to be sure, a formal acknowledgment of the fatherhood of Dyaus (among gods he is father particularly of Dawn, the Acvins, and Indra), as there is of the motherhood of Earth, but there is no further exaltation.