Guaraci

Guaraci is the sun god and the son/creation of Tupã. He is also responsible for watching over and taking care of all living beings during the day. During the night, this task is passed to his sister/wife Jaci.

Legend
There are two tales whose purpose is to reveal how Jaci and Guaraci fell in love and these are:

Union by Dawn
One day Guaraci got tired of his eternal job and needed to sleep. Being the god of the Sun, when he closed his eyes, the world fell into darkness. Taking pity on him, Tupã decided to let him sleep and created Jaci, the moon goddess, to help him light up the world. Upon awakening, Guaraci noticed Jaci and how beautiful she was and soon he fell in love.

So delighted, he went back to sleep so that he could see her again, but whenever he opened his eyes again to admire her, everything would light up again and Jaci would go to sleep, having her mission accomplished.

Guaraci then asked Tupã to create someone who could communicate Jaci his love, thus Rudá, love itself and its messenger, emerged. Love knew no light or darkness, thus uniting the Sun and Moon at dawn.

Never Reuniting Again
One day, Jaci was wandering through the Amazon rainforest, when he saw Guaraci. He was a handsome warrior, whose eyes of fire, golden skin that emitted radiant energy. The moment Guaraci laid eyes on Jaci, he fell in love with her silvery beauty and shyness.

As they declared their love for each other, Guaraci began to burn with such passion that he realized he was setting the Earth on fire. At the same time, Jaci was so overcome with love that she began to cry tears of happiness, which nearly flooded the Earth.

Realizing they were unable to control their emotions, Jaci and Guaraci decided it was too dangerous for them to be together and reluctantly, they agreed never to meet in the same location again.

Guaraci soon forgot about Jaci, who made sure never to show up before Guaraci went to sleep. However, Jaci has become so heartbroken that she cries every night and her tears run down the leaves of the trees, forming puddles on the forest floor that run down the mountains, thus creating the great Amazon River.