In Vedic cosmology Prithvi symbolizes the material base as mother and the 'Dyaus', the upper sky delineates the unmanifest immortal source as father, which together and between them provides ecosphere in a mystical ambiance.
The Indo-European pantheon of deities was presided over by Dyeus Pather or the Sky Father who had the same attributes as the Dyaus Pita or Heaven Father of the Vedic Pantheon.
This is why there is no surprise that we find gods similar to ours (I mean pre-Christian) in Indian vedic tradition--like Sanskrit "Dyaus," Latvian "Dievs"; Sanskrit/Hindi "Devanamas," Latvian "dievnams." When as a child I was looking in the mirror my father used to say: "Tat tvam asi," meaning "tas tu esi" (this is what you are).