he's described that way for obvious reasons anon, it's because christianity is adapted from older religions that worshipped the sun. god is the sun.  the bible is an astrological allegory. it's why jesus is born, lives, dies, and is resurrected. the apostles represent the other planetary bodies. he's the "sun" of god. the sun that rises, sets, and then comes back in the morning. this was a staple of many different sun cults, like the mithraics and the zoroastrians, as well as the egyptian mystery schools.
Canada