where was he primarily worshipped?
The chief cultic center of Ra was "Iunu" "the Place of Pillars", later known to the Ptolemaic Kingdom as Heliopolis (,  "Sun City") and today located in the suburbs of Cairo.
Ra
The chief cultic center of Ra was "Iunu" "the Place of Pillars", later known to the Ptolemaic Kingdom as Heliopolis (,  "Sun City") and today located in the suburbs of Cairo. 
map of tombs in valley of the kings In 1799, members of Napoleon's expedition to Egypt (especially Vivant Denon) drew maps and plans of the known tombs, and for the first time noted the Western Valley who were these tombs built for? For the pharaohs and powerful nobles of the New Kingdom can you name some of the artefacts found inside these tombs? The royal tombs are decorated with scenes from Egyptian mythology and give clues as to the beliefs and funerary practices of the period. Almost all of the tombs seem to have been opened and robbed in antiquity, but they still give an idea of the opulence and power of the pharaohs. can you name some deities who feature in the mythology you just mentioned? Ra,  Osiris, Isis, Horus,  Set. do they appear in textual sources from that era? Yes,  "Teaching for King Merykara", "Tale of the Two Brothers", "The Blinding of Truth by Falsehood" when was the first one composed? UNANSWERABLE what is the first deity you mentioned above a god of? Ra is the ancient Egyptian deity of the sun portrayed as a falcon and shared characteristics with the sky god Horus.
wiki:11244637
Ra [SEP] Worship
By the Fourth Dynasty, pharaohs were seen as Ra's manifestations on earth, referred to as "Sons of Ra". His worship increased massively in the Fifth Dynasty, when Ra became a state deity and pharaohs had specially aligned pyramids, obelisks, and sun temples built in his honor. The rulers of the Fifth Dynasty told their followers that they were sons of Ra himself and the wife of the high priest of Heliopolis. These pharaohs spent much of Egypt's money on sun temples. The first Pyramid Texts began to arise, giving Ra more and more significance in the journey of the pharaoh through the Duat (underworld).