The sun is the ball of fire in the sky that the Earth goes around, and that gives us heat and light.
The sun was now high in the southern sky.
太阳当时正高挂在南面天空上。
The sun came out, briefly.
太阳出来了,一会儿就没了。
You refer to the light and heat that reach us from the sun as the sun.
Dena took them into the courtyard to sit in the sun.
德娜把他们带到院子里,坐着晒太阳。