In The Rig Veda
According to one version of Creation as embodied in the Rigveda (RV), mortal life emerged from the procreation by Dyauṣ Pitā, whereby the mother Earth, goddess Prithivi was impregnated by the Dyauṣ Pitṛ by way of rains.
In the Rig Veda, Dyaus Pitar appears in hymns 1.89, 1.90, 1.164, 1.191 and 4.1 in simple invocations.
In RV 1.89.4b, Pitar Dyaus meaning the "Father Sky" appears alongside Mata Prithvi "Mother Earth".
In the Purusha Suktam, Dyaus is described to have been created from the head of the primaeval being, the Purusha.
Dyauṣ Pitṛ has been depicted during the day-time as a red bull who bellows thunder (in juxtaposition to the Prithvi Mata, represented as a cow), or as the night heavens in form of a black horse adorned with pearls, symbolizing the stars. The dark Dyaus also holds a thunder-stone. In art, Dyaus appears in both the above two different forms.
Read more about this topic: Dyaus Pita