The Solar Trinity

The ancients took the Sun as the external symbol of the Absolute Self.

The Sun at dawn is the Creator Brahma

At midday he is the destroyer Shiva

At Sunset he is the Preserver Vishnu

He is the lord of all the three realms!

Brahmaswaroopa Udaye

Madhyahne Thu Sadasiva

Astha Kale Swayam Vishnu
Trailokyam Dinakarah

The Western mystics took his three manifestations as Father, the Son and the Holy Ghost.

Manly P Hall writes in " The Secret Teachings of the Ages" thus

The philosophers of Greece and Egypt divided the life of the sun during the year into four parts; therefore they symbolized the Solar Man by four different figures. When He was born in the winter solstice, the Sun God was symbolized as a dependent infant who in some mysterious manner had managed to escape the Powers of Darkness seeking to destroy Him while He was still in the cradle of winter. The sun, being weak at this season of the year, had no golden rays (or locks of hair), but the survival of the light through the darkness of winter was symbolized by one tiny hair which alone adorned the head of the Celestial Child. (As the birth of the sun took place in Capricorn, it was often represented as being suckled by a goat.)

At the vernal equinox, the sun had grown to be a beautiful youth. His golden hair hung in ringlets on his shoulders and his light, as Schiller said, extended to all parts of infinity. At the summer solstice, the sun became a strong man, heavily bearded, who, in the prime of maturity, symbolized the fact that Nature at this period of the year is strongest and most fecund. At the autumnal equinox, the sun was pictured as an aged man, shuffling along with bended back and whitened locks into the oblivion of winter darkness. Thus, twelve months were assigned to the sun as the length of its life. During this period it circled the twelve signs of the zodiac in a magnificent triumphal march. When fall came, it entered, like Samson, into the house of Delilah (Virgo), where its rays were cut off and it lost its strength. In Masonry, the cruel winter months are symbolized by three murderers who sought to destroy the God of Light and Truth.
The coming of the sun was hailed with joy; the time of its departure was viewed as a period to be set aside for sorrow and unhappiness. This glorious, radiant orb of day, the true light "which lighteth every man who cometh into the world," the supreme benefactor, who raised all things from the dead, who fed the hungry multitudes, who stilled the tempest, who after dying rose again and restored all things to life--this Supreme Spirit of humanitarianism and philanthropy is known to Christendom as Christ, the Redeemer of worlds, the Only Begotten of The Father, the Word made Flesh, and the Hope of Glory.