If bugs are attracted to sun light, how come they don't fly endlessly and helplessly towards the sun?

Bugs need light to see. Thats why at night they crowd endlessly around around street lamps and other sources of artificial light. But during the day, everything is illuminated by the sun and they can see they're way around even though the sun is the brightest thing during the day. When they can see the environment around them , they can worry about other things such as feeding, breeding, and watching out for predators.