A solar deity or sun deity is a deity who represents the Sun, or an aspect of it. Such deities are usually associated with power and strength. Solar deities and Sun worship can be found throughout most of recorded history in various forms. The Sun is sometimes referred to by its Latin name Sol or by its Greek name Helios. The English word sun derives from Proto-Germanic *sunnǭ. Overview Predynasty Egyptian beliefs attribute Atum as the Sun god and Horus as god of the sky and Sun. As the Old Kingdom theocracy gained influence, early beliefs were incorporated into the expanding popularity of Ra and the Osiris-Horus mythology. Atum became Ra-Atum, the rays of the setting Sun. Osiris became the divine heir to Atum's power on Earth and passed his divine authority to his son, Horus. Other early Egyptian myths imply that the Sun is incorporated with the lioness Sekhmet at night and is reflected in her eyes; or that the Sun is found within the cow Hathor during the night and reborn each morning as her son (bull). Mesopotamian Shamash played an important role during the Bronze Age, and "my Sun" was eventually used to address royalty. Similarly, South American cultures have a tradition of Sun worship as with the Incan Inti. In Germanic mythology, the solar deity is Sol; in Vedic, Surya; and in Greek, Helios (occasionally referred to as Titan) and (sometimes) as Apollo. In Proto-Indo-European mythology the sun appears to be a multilayered figure manifested as a goddess but also perceived as the eye of the sky father Dyeus. Solar myth Three theories exercised great influence on nineteenth and early twentieth century mythography. The theories were the "solar mythology" of Alvin Boyd Kuhn and Max Müller, the tree worship of Mannhardt, and the totemism of J. F. McLennan. Müller's "solar mythology" was born from the study of Indo-European languages. Of them, Müller believed Archaic Sanskrit was the closest to the language spoken by the Aryans. Using the Sanskrit names for deities as a base, he applied Grimm's law to names for similar deities from different Indo-European groups to compare their etymological relationships to one another. In the comparison, Müller saw the similarities between the names and used these etymological similarities to explain the similarities between their roles as deities. Through the study, Müller concluded that the Sun having many different names led to the creation of